2. Nine copper coins, one of which is fake, and the authenticity is only different in quality. If you weigh it at least (8 times) with a balance without weight, you can definitely find out the fake copper coins.

3. There is a warehouse ***5 warehouses every100km on the highway. Warehouse 1 has 10 tons, warehouse 2 has 20 tons, warehouse 5 has 40 tons, and the other two warehouses are empty. Now I want to put all the goods in one warehouse. If the freight of 1 km per ton of goods needs 1 yuan, then it needs at least (10000) yuan.

1No. 100 km 2 100 km 3 100 km 4 100 km 5.

10 tons, 20 tons and 40 tons

There are 207 students in Grade 6 * *, of whom 2/ 1 1 boys and 7 girls were selected to take part in the math contest. The number of other boys and girls is the same, with 97 girls in grade 6.

5. Xiaolan and Xiaoli play guessing games. Xiaolan writes a four-digit decimal on the straight line for Xiaoli to guess. Xiaoli asked, "Is it 603 1?" Xiaolan said: "I guessed a number, and the location is correct." Xiaoli asked again, "Is it 5672?" Xiaolan said: "I guessed both numbers correctly, and neither position is right." Xiaoli asked again, "Is it 4796?" Xiaolan said, "I guessed four numbers right, but none of them are right." Can you infer the four digits written by Xiaolan from the above information? 6974

6. If 20 rabbits can be exchanged for 2 sheep, 8 sheep for 2 pigs and 8 pigs for 2 cows, how many rabbits can 4 cows be exchanged? 640

7. Light light blue is 8 years old and my father is 38 years old. How old is light light blue? Dad is exactly four times as old as light light blue. 10

8. For the people, every three empty soda bottles can be replaced by 1 bottle. Light light blue bought 99 bottles of soda in the summer vacation, and changed them into empty bottles after drinking them. How many bottles of soda can she drink at most? 147

9. In a division formula, the sum of dividend, divisor, quotient and remainder is 75, the known quotient is 8, and the remainder is 2. What are the dividend and divisor?

58 7

10. There are two iron wires of the same length. The first one is minus 30 cm, the second one is minus 18 cm, and the remaining length of the second one is twice that of the first one. How many centimeters is left in the second wire? 24

There are 1 1, 1, 2, 3, 4, 5, 6, 7, 8 and 9 cards, each with three cards. A said, "The product of my three cards is 48", and B said, "The sum of my three cards is 65438.

238 564 179

/kloc-how many different rectangles can a 0/2.24cm long iron wire enclose (the length and width are all whole centimeters, not counting joints)? What are the areas? Compare it again. What can you find? six

13 Master Zhang is used to taking two days off every five days of work. Recently received the task of producing 330 parts. He produces 30 parts every day. How many days will it take to complete this task? 15

On Sunday, Xiaohui took a taxi to visit her grandmother 8 kilometers away. When taking the bus, he looked at the fare list on the taxi: 8 yuan within 5 kilometers; More than 5 kilometers per kilometer in 2 yuan. How much does Xiaohui have to pay to go to grandma's house?

14

15, a decimal, if you expand its decimal part by 4 times, you will get 5.4; If you enlarge its decimal part by 9 times, you get 8.4. What is this decimal? 3、6

16, average height of Party A and Party B 1.66m, average height of Party B and Party C 1.7m, average height of Party A and Party C 1.65m, what is the average height of Party A, Party B and Party C?

1。 67

17, the sum of a, b and c is 270. A is three times that of B, and B is twice that of C. What are the numbers of A, B and C respectively?

180 60 30

18. There are two coal yards A and B. The coal storage capacity of coal yard A is three times that of coal yard B. If 180 tons is transported from coal yard A to coal yard B, the coal storage capacity of the two coal yards is equal. How many tons are there in coal yard A and coal yard B respectively?

540 180

19, five players line up to do exercises, among which 1 new players can't stand at the head. How many different ways are there?

96

There are 50 students in Class 20.6 (1). There are 25 swimmers, 28 gymnasts and 5 non-gymnasts. How many students can swim and do gymnastics? eight

2 1. It takes 6 hours for the ship "Youth" to sail along the river at 120km, and 20 hours to sail against the current at 280km. How many hours does it take for a ship to sail 340 kilometers in still water?

20

22. Arrange all the simplest false scores with denominator of 15 from small to large, and find the numerator of the 99th false score.

2 14

23. Make a bouquet with 96 red flowers and 72 white flowers. If there are the same number of red flowers and the same number of white flowers in each bouquet, how many flowers are there in each bouquet?

84

2. There are 240 students taking part in large-scale group gymnastics. They stand in a row facing the coach and press 1, 2, 3, 4, ... from left to right. The coach asked each student to remember the number he quoted and do the following actions: first, let the students who quoted a multiple of the number 3 back off, then let the students who quoted a multiple of 5 back off, and finally let the students quote a multiple of 7. 34+80+48- 16-6- 1 1= 162-33= 129

1. The mountain village postman went over the mountains from the post office and took 6.5 hours to deliver the mail to the user's home. His speed up the mountain is 3 kilometers per hour, and his speed down the mountain is 5 kilometers per hour. How long does it take to return at the same speed?

4.7

1.8 8 3 3 Calculate 24 with+-*/().

2.3 3 7 7 Use+-*/() to calculate 24.

3. Bus length190m, truck length 240m. The two cars are traveling at a speed of 20 meters per second and 23 meters per second respectively. How many seconds does it take to meet from front to back on the double-track railway?

An: 10 second.

4. Calculate1234+2341+3412+4123 =?

5. The first item in arithmetic progression is 5.6, and the sixth item is 20.6. Find its fourth project.

6. The sum is 0.1+0.3+0.5+0.7+...+0.87+0.89 =?

7. Coins with 1.2.5 cents * * 100, with a total value of 2 yuan. It is known that the total value of 2-cent coins is more than 1 cent coins 13 cents. How many coins are there in each of the three types?

8. The distance between A and B is 465 kilometers. It takes * * * 7 hours for a car to travel from A to B at a speed of 60km/h, and then speed up 15km/h to arrive at B. How many hours have you been driving at a speed of 60 km/h?

9 .. There are several chickens and rabbits in the cage, which are *** 100 feet. If the chicken is replaced by a rabbit and the rabbit is replaced by a chicken, it will have 92 feet. How many rabbits and chickens are there in the cage?

10. Spiders have eight legs, dragonflies have six legs and two pairs of wings. Cicada has six legs, 1 pair of wings. At present, there are 18 of these three kinds of bugs, with 1 18 legs and 20 pairs of wings. How many bugs are there in each species?

1 1. In the activity of learning from Lei Feng, students * * * did 240 good deeds, senior students each did 8 good deeds, and junior students each did 3 good deeds, with an average of 6 good deeds. How many students are there in this activity?

12. A class of 42 students participated in tree planting, with an average of 3 trees planted by boys and 2 trees planted by girls. It is understood that boys plant 56 more trees than girls. How many boys and girls are there?

13. There are 6 different Chinese books, 4 different foreign language books and 3 different math books on the bookshelf. How many different ways can you get them?

14. Students in one class plant trees, and there are 100 Chinese fir seedlings and poplar seedlings. Each group was divided into 6 Chinese fir seedlings and 8 poplar seedlings. In this way, the Chinese fir seedlings have just been beaten, and there are two poplar seedlings left. How many Chinese fir seedlings and poplar seedlings are there?

15. With 8 kilograms of silk, you can weave silk with a width of 6 centimeters with 4 meters. Now silk has 10kg. How many meters can a 7.5 decimeter wide silk weave?

16. Here is a number of 1 1, and the sum of every three adjacent numbers is 15. Do you know what the question mark means? What's the number of this 1 1?

17 ... Party A, Party B and Party C bought eight loaves and shared them equally. Party A paid five cakes, Party B paid three cakes, and Party C didn't bring any money. After calculation, C should pay 4 yuan, and how much should A take back?

18. Football has five teams: A, B, C, D and E, and each team has to play a game with other teams. How many games are there altogether?

19. 12 total coin value 1 yuan, of which only five cents and 1 minute. How many coins are there?

20. Party A and Party B go to the store to buy clothes. Party A 100 Yuan, Party B 70 yuan. After they bought clothes at the same price, they found that the money left by Party A was exactly four times that of Party B. How much did Party A and Party B spend on clothes?

2 1.57 military vehicles lined up to cross a bridge with a distance of 2m. The bridge is 200 meters long, and each military vehicle is 5 meters long. How many meters is it from the front of the first car to the rear of the last car?

22. Buying 18 table with 6 chairs costs 1560 yuan, and the price of 10 table is more than the price of 6 chairs. 680 yuan, how much is each table? How much is each chair?

23 ..A Two oil storage tanks, A and B, have less oil storage than B. Enter 1/6 1/4 B into A. A has 2 tons more oil storage than B. How many tons does B have?

24. The factory organized 400-450 people to participate in tree planting activities, and each person planted 32 trees on average. Male workers and female workers planted an average of 48 trees and 65,438+03 trees respectively. How many male and female workers took part in planting trees? (Number of people in proportion)

25. Stores A, B and C have 120 pieces of relief materials, which is the sum of warehouses A and C, and C is half of warehouses A and B. How many pieces of relief materials are there?

26 .. A, B and C installed 500 TV sets in three groups. The ratio of the number of TV sets installed in the two groups is 5:3, and C is 39 fewer than B. How many TV sets has C installed? (Suppose there are 39 units left in C)

27. The distance between A and B is 243 kilometers. A van and a bus leave from A and B at the same time, face to face, 1.5 hours later. The speed ratio of truck and bus is 4:5, so how many hours will it take for the bus to complete this journey? (two methods)

28. A daily chemical factory produced 9800 pieces of laundry soap, 5/9 more than the soap produced. How many boxes of laundry soap and soap are produced? (Solving problems skillfully with variable rate)

29. Xiao Ming and Xiao Cong started running back and forth at both ends of the 60-meter runway respectively. Xiao Ming runs 2 meters per second and Xiao Cong runs 3 meters per second. They ran for five minutes. How many times have they met during this period?

Xiao Qiang bought three pencils, three ballpoint pens, eight notebooks and twelve erasers. The salesman said * * * should pay 13 yuan, 1 minute. People know that 2 yuan has a 4-cent pencil and an 8-cent ballpoint pen in his money. He asked the shop assistant if his account was wrong.

3 1. For a project, Party A will work alone for 3 days, and Party B will sit alone for 5 days. Now Party A will do 1 day first, and how many days will the remaining cooperation between Party A and Party B be completed?

32. The rice in warehouse B is 4/5 of that in warehouse A. If 4 tons of rice is transferred from warehouse A to warehouse B, the weight ratio of rice in warehouse A and warehouse B is 3: 4. How many tons of rice were originally stored in warehouse B and warehouse B?

At 33.7: 00, the minute hand lags behind the hour hand by 100 degrees.

34. Two cars start from A and B at the same time, face to face, each lane of A is 50 kilometers, and each lane of B is 60 kilometers, and they meet after 3.5 hours. How many kilometers is it between A and B? (Answer in two ways)

35. Xiaoming and Xiaoqing's homes are 4.5 kilometers apart. They both ride bicycles from home at the same time. Xiaoming travels 50 meters per minute and Xiaoqing travels 40 meters per minute. How many minutes did they meet?

36. Xiaoming and Xiaoqing's homes are 4.5 kilometers apart. They both ride bicycles from home at the same time. Xiaoming travels 50 meters per minute and Xiaoqing travels 40 meters per minute. How many minutes did they meet?

37. Buses and trucks start from two cities at the same time and go in opposite directions. Buses travel 45 kilometers per hour, 3 kilometers more than trucks. Four hours later, the two cars met. How many kilometers are the two cities apart?

At the same time, two engineering teams are opening an 850-meter-long tunnel from both ends. Team A digs 26 meters every day, while Team B digs 24 meters every day. How many days will it take to pass?

6. Master and apprentice work together to process a batch of parts. The master processes 68 parts per hour and the apprentice processes 55 parts per hour. They worked together for six hours to finish the task. How many parts are there in this batch?

7. The processing plant uses two mills to grind 17280 kg at the same time. The first grinder grinds 364 kilograms per hour, and the second grinder grinds 356 kilograms per hour. If the flour is processed for 8 hours every day, how many days will it take to finish grinding?

Second, start at the same time and run counter to each other.

1, Party A and Party B start from the school at the same time and go in opposite directions. A walks 60 meters per minute, and B walks 70 meters per minute. How many meters are they apart after 5 minutes? (Answer in two ways)

The first method: the second method:

Two cars start from a factory at the same time and go in opposite directions. One car travels 33 kilometers per hour, and the other car travels 42 kilometers per hour. How many minutes later, the distance between two cars 15km?

Third, start at the same time, move in the opposite direction, and don't meet.

1, the railway between Station A and bilibili is 560 kilometers long. Two trains leave from two stations at the same time. One train runs at 63.5 kilometers per hour, and the other train runs at 80.5 kilometers per hour. How many kilometers are there between the two trains after three hours?

2. The trucks and buses leave from Party A and Party B relatively simultaneously. Trucks travel 57.5 kilometers per hour and buses travel 45.8 kilometers per hour. After 3 hours, the distance between the two cars is 100 km. How many kilometers is the distance between Party A and Party B?

3. Master and apprentice process 3 12 parts at the same time. The master processes 45 parts per hour and the apprentice processes 35 parts per hour. How many hours after processing, there are 40 parts left?

Fourth, don't start at the same time and move in the opposite direction.

1, Train A and Train B travel relatively from two places. Car A is 75 kilometers per hour, and car B is 69 kilometers per hour. A car leaves 1 hour later, B car leaves and meets in 5 hours. How many kilometers is the railway between these two places? (Answer in two ways)

The first method: the second method:

2. The waterway of Port A and Port B is 726 kilometers long. A cargo ship sailed from Port A to Port B at a speed of 69 kilometers per hour. 1 hour later, a passenger ship set sail from port b at a speed of 77 kilometers per hour. How many hours after the passenger ship left, it met the cargo ship? How many kilometers did the passenger ship travel when it met the cargo ship?

3. For a batch of 478 parts, Party A processes 50 parts per hour, while Party B processes 32 parts per hour. Party A processes for 3 hours first, and the remaining two people work together for several hours to complete the task.

5. Same time, same place, same direction.

Both Party A and Party B ride bicycles from A to B at the same time. Party A travels14.2km per hour and Party B travels18.7km per hour. How many kilometers are they apart after 8 hours? (Answer in two ways)

The first method: the second method:

Travel application problem

1. The bus and truck depart from Party A and Party B respectively, with a distance of 387 kilometers. The bus travels 1 hour, traveling 72 kilometers per hour, and meets the bus 2.5 hours after the truck leaves. How many kilometers does this truck travel per hour?

Two cars, A and B, are driving in the same direction at the same time. Car A travels 42 kilometers per hour and car B travels 45 kilometers per hour. How many kilometers are the two cars apart after 2.4 hours?

3. Two ships, Party A and Party B, leave the dock in opposite directions at the same time. Party A travels 23.5km per hour and Party B travels 2 1.5km per hour. After several hours of sailing, the distance between the two ships is 3 15km.

4. Two trains, A and B, leave from two places 453 kilometers apart at the same time. The speed of train A is 45 kilometers per hour. Five hours have passed, and the distance between the two cars is still 28 kilometers. How many kilometers does the second car travel per hour?

A car travels from place A to place B at a speed of 56 kilometers per hour. Three hours later, there are still six kilometers from the midpoint. How many kilometers is the bus from B?

6. Two trains leave from Party A and Party B at the same time. The first train departs from Station A at a speed of 50 kilometers per hour, and the second train departs from bilibili at a speed of 60 kilometers per hour. When the two trains met, the first train had just finished the journey, and there were still 300 kilometers from bilibili ... How many kilometers between A and B?

7. Two students, A and B, are running in the same direction on a 400-meter track. A is 5 meters per second and B is 6 meters per second. They met in a few seconds.

8. Zhao Lan walks to school, walking 75 meters per minute. Six minutes after Zhao Lan left home, her mother found that Zhao Lan was not wearing a red scarf, so she rode a bicycle to catch up and walked 375 meters per minute. A few minutes after Mom left, could she catch up with Zhao Lan?

9. Two cars, A and B, are driving in opposite directions from two places at the same time. A travels 83 kilometers per hour and B travels 95 kilometers per hour. The two cars met at a distance of 24 kilometers from the midpoint. How far is the distance between the two places?

10, the two trains A and B leave from two opposite stations respectively. Train A travels 48 kilometers per hour and train B travels 52 kilometers per hour. If train A travels 20 kilometers less than train B when they meet, what is the distance between the two stations?

1. There are 28 children waiting in line. The number from the left 10 is Aihua. What's the number on his right?

2. new york time is HK time minus 13 hours. You have an appointment with a friend in new york to call him at 8 pm on April 1 new york time. When should you call him in Hong Kong?

A worker can process 90 parts in 5 hours. /kloc-how many workers does it take to process 540 parts in 0/0 hour?

4. How many integers greater than 100 have the same quotient and remainder after dividing by 13?

5. Four rooms, with no less than two people in each room and no less than eight people in any three rooms. How many people are there in these four rooms?

There are two digits in the divisor (or factor) of1998. 7. In the English test, Xiao Ming scored an average of 88 points in the first three times. If he wants to average 90 points, what is his lowest score for the fourth time?

Numbers, which number is the largest?

15. Two people play a game: take turns to count off, and the count off can only be 1, 2, 3, 4, 5, 6, 7, 8. Add up the figures reported by two people. After the number is reported, the plus sign is 123, and the winner will give priority to the number.

16. The page number of the novel must be printed in the font of 1989. 1 How many times does this number appear in the page number of this book?

What are the last four digits of the sum of 17.23: 3, 33, 333, …, 33…3(23 3s)?

18. Arrange the eight numbers 1, 1, 2, 2, 3, 4, 4 into an eight-digit number, so that there is a number between two 1, two numbers between two 2, three numbers between two 3 and two 4. So, here's the thing.

19. How many natural numbers can you take from 1, 2, 3, …, 2004, 2005 at most, so that the difference between every two numbers is not equal to 4?

20. There is a six-digit telephone number, in which the three digits on the left are the same, and the three digits on the right are three consecutive natural numbers, and the sum of the six digits is exactly equal to the last two digits. What's the phone number?

2 1. If a is a natural number, prove 10 │ (A2005-A 1949).

22. Give 12 different two-digit numbers, and prove that two numbers can be selected from them, and their difference is a two-digit number composed of two identical numbers.

23. Find the smallest three digits of 2 divided by 3, 3 divided by 5 and 5 divided by 7.

24. Let 2n+ 1 be a prime number, and prove that:12,22, …, n2 is divided by 2n+ 1 to get different remainders.

25. The difference between the sum of squares of prime numbers not less than 5 1 will be divisible by 24.

26. There are two kinds of sugar water, A contains 270g of sugar, 30g of water, B contains 400g of sugar, and water100g. Now we want to get100g of 82.5% sugar water. How many grams should we take from everyone?

27. A container contains 65,438+00 liters of pure alcohol. After pouring out 1 l, fill it with water, then pour out 1 l, and then pour out 1 l. What is the concentration of alcohol solution in the container?

28. A few kilograms of 4% salt water evaporated part of the water and became 10% salt water. After adding 300 grams of 4% salt water, it becomes 6.4% salt water. How many kilograms was the original salt water?

29. It is known that a few grams of brine, after adding a certain amount of water for the first time, the concentration of brine becomes 3%, and after adding the same amount of water for the second time, the concentration of brine becomes 2%. Add the same amount of water for the third time to find the concentration of brine.

30. There are three kinds of brines, A, B and C, which are mixed according to the quantity ratio of A to B of 2: 1 to obtain brines with the concentration of 13%; According to the mass ratio of A to B 1: 2, the brine with the concentration of 14% was obtained; According to the mass ratio of A, B and C 1: 1: 3, the brine with the concentration of 10.2% was obtained. What is the concentration of brine C?

1) The fruit shop imports * * * 390 kilograms of apples, bananas and pears a day. The weight of apples is 1.5 times that of pears, and the weight of bananas is 3/4 of that of pears. How many kilograms of each of the three fruits?

(2) One pot of water used 1/2 and 5 barrels, leaving 30%. How many buckets of water are there in this water tank?

(3) There is a square wood, the fast side is 20 cm long, and it is planed into a cylinder with the largest diameter at the bottom. What is the volume of wood planed out?

(4) The length of a steel pipe is10m. Cut off 7/ 10 for the first time, and cut off the remaining 1/3 for the second time. How many meters are left?

(5) Assemble radios in two groups. Group A assembles 50 radios every day, and completes 10% of the total task on the first day. At this time, Group B began to assemble 40 radios every day. How many days did it take Group A to complete these tasks?

(6) After the highway is built, the total length is 2/3, and the distance is16.5km.. What is the total length of this highway?

(7) The master and the apprentice made a batch of parts together, and the apprentice made 2/7 of the total, 2 1 less than the master. How many parts are there in this batch?

(8) Two teams build a highway. Team A builds 65438+ 0.5 of the total length every day, and Team B works alone for 7.5 days. If the two teams work together for two days, the rest will be repaired by team B alone. How many days will it take?

(9) There is a batch of chemical fertilizers in the warehouse, and 2/5 of the total amount is taken out for the first time, and 1/3 of the total amount is less than 12 bags for the second time. At this time, there are 24 bags left in the warehouse. How many bags are taken out twice?

(10) In the distance of 720m, the front wheel turns 40 times more than the rear wheel. If the circumference of the rear wheel is 2m, find the circumference of the front wheel.

The number of (1 1) A is 1.2 times the average of three numbers. If the sum of B and C is 99, what is the number of A?

(12) There is a project that plans to use 800 workers, and the construction period is 100 days. I didn't expect to stop work due to an accident 35 days after the start of construction, and continue construction 25 days later. How many more workers will be needed if the work is to be completed within the time limit?

(13) The fruit shop bought several kilograms of apples at the price of 1.5 kilograms of 2 yuan money and sold them at the price of 2.5 kilograms of 4 yuan money. If the store wants to make a profit of 100 yuan, how many kilograms of fruit must this fruit shop sell?

(14) The walking speeds of Party A, Party B and Party C are 30m, 40m and 50m per minute respectively. Party A and Party B are in place A, and Party C is in place B. Both parties walk in opposite directions at the same time. After Party C meets Party B, meet Party A in 10 minutes. How many meters are the two places apart?

(15) It takes 15 minutes for Party A to go from the east village to the west village, and 15 minutes for Party B to go from the west village to the east village. Two people set out at the same time and walked towards each other. When they met, the distance was 150 meters, thus finding the distance between the two villages. & lt/P & lt； p & gt

(16) A car runs 2/5 of the whole course on the first day, and the rest on the second day 1/2. The distance on the third day is less than that on the first day 1/3, and the remaining distance is 50 kilometers. How many kilometers is the journey?

(17) The passenger ship sails from Port A to Port B at a speed of 24 kilometers per hour. It took 12 hours for the cargo ship to sail from port B to port A. At the same time, when they met, the ratio of passenger ships to cargo ships was 6: 7, and the distance between the two ports was 6: 7.

(18) The distance between Station A and bilibili is1134km. A bus and a truck leave from two stations at the same time and meet at 10 hour and 30 minutes. The speed of a truck is seven-fifths that of a bus. How many kilometers does this bus travel per hour?

(19) The number of male employees in an assembly workshop is equivalent to 20% of female employees. It is understood that there are female employees 130 in this workshop. How many male employees are less than female employees?

(20) 25 kg of salt water with a salt content of 20%. After adding some water, the salt content is 8%. How much water did you add?

(2 1) There are 307 tons of grain in warehouses A, B and C. After 40 tons are shipped out, the surplus grain weight ratio of warehouse A and warehouse B is 3: 5, and that of warehouse B and warehouse C is 3: 4. How many tons of raw grain is there in warehouse C?

(22) Workshop A and Workshop B need to process a batch of flour, and the planned task ratio of 130% is 8: 5. Workshop B is less than Workshop A 13.5 tons ... How many tons of flour was originally planned to be processed?

Application problem 2

(1) There are two baskets of fruit. The fruit in the first basket weighs 32 kilograms. After taking out 20% from the second basket, the weight ratio of the two baskets of fruits is 4:3. How many kilograms were there in the original two baskets of fruit?

(2) It is planned to install 120 TV sets. If you install 8 TV sets every day, you can finish the task one day in advance and four days in advance, then how many TV sets should you install every day?

(3) The distance between Party A and Party B is 1 152km, and a bus and a truck leave both places at the same time. Trucks run 72 kilometers per hour, 2/7 faster than buses. How many hours did it take for two cars to meet?

(4) The school bought a batch of books and distributed them to all classes. If each class is divided into 25 books, there will be 22 more books. If each class is divided into 30 books, there will be 68 books missing. How many classes are there? How many books did you buy?

(5) The fruit company stores a batch of apples, and after selling 30%, it delivers 160 boxes, which is more than the original apples110. How many boxes of apples are there?

(6) The greening team rebuilt the garden in the center of the street and used it in 900 yuan. Compared with the original plan, it saves 300 yuan and a few percent. & lt/P & lt； p & gt

(7) A road construction team built a road, originally planned to build 200 meters a day, but actually built 50 meters more every day. As a result, the task was completed three days ahead of schedule. What is the total length of this road?

(8) There is a rectangular ingot with a circumference of 2m at the bottom and an aspect ratio of 4: 1, which is 25% less. Can be cast into a cone with a height of 3 meters. What is the bottom area of the cone?

(9) For a conductor, 37.5% of the total length is used for the first time, and 27 meters is used for the second time. At this time, the length ratio of used metal wire to useless metal wire is 3:2. How long is this wire?

(10) There are 6 more boys in one class than 5/7 in the whole class, and 4 fewer girls than the whole class 1/4. How many people are there in the class?

(1 1) Warehouse A originally stored 50 tons less grain than Warehouse B. After transferring 30 tons of grain from Warehouse A to Warehouse B, the grain storage in Warehouse A was less than that in Warehouse B.1/4 .. How many tons of grain does Warehouse B store now?

(12) Diesel oil is put into a cylindrical oil drum. It is known that the bottom of the oil drum has a diameter of 6 decimeters and a height of 10 decimeter. When full, the weight of the bucket is 280 kilograms. It is known that a liter of diesel weighs 0.85 kg, so how many kg does the barrel weigh?

(13) A store buys a batch of pens at 10.9 yuan and sells them at 14 yuan. When we sold 4/5 of these pens, we not only recovered all the costs, but also made a profit 150 yuan. How many pens are there in this batch?

(14) When processing a batch of parts, the master can process 54 pieces a day, and if the apprentice processes them alone, it can be completed in 17 days. Now two people are working at the same time. When the task is completed, the ratio of the number of parts processed by master and apprentice is 9:8. How many parts are there in this batch?

(15) Class 6 (1) The original 1/5 students took part in the labor, and then two students took the initiative to participate, so the actual number of participants was 65438+ the rest 0/3. How many people actually took part in the labor?

(16) has *** 100 big balls, 1/3 big balls1/0 small balls 16. How many balls and balls are there respectively?

(17) My mother bought 3kg of bananas and 2kg of pears * * * paid 13 yuan. As we all know, the unit price of pears is 2/3 of that of bananas. How much is a kilo of pears?

(18) The master and the apprentice made a batch of parts together, and the ratio of the parts made by the master and the apprentice was 9:7. Results When the task was completed, the master made 5/8 of the total, 30 more parts than originally planned. How many parts does the master plan to manufacture?

(19) A box of candy * * * has 80 pieces, which are distributed to two brothers. Brother eats his own 1/3, brother eats 10, and then eats 5 pieces. The remaining two people are just equal. How much did the two brothers get? & lt/P & lt； p & gt

(20) There are two ropes, and rope A is 35 meters longer than rope B. It is known that 1/9 of rope A is equal to 1/4 of rope B. How long are these two ropes?