2. build a road. It was originally planned to build 0.4 kilometers a day, which can be completed in 70 days. The actual number of meters repaired every day is 1.25 times as planned. How many days will it take to complete?
3. The greening team plans to plant trees and complete the task in 8 days. In reality, 240 trees are planted every day, and the specific task of planting trees is completed in 7 days. How many more trees are planted than planned every day?
4. Send brown sugar and white sugar to a village. 2 bags of brown sugar and 5 bags of white sugar were distributed to each household. When the brown sugar was delivered to the last household, 10 bag of white sugar was left. It is known that the number of bags of white sugar is three times that of brown sugar, so how many bags of brown sugar and white sugar do you bring?
The clothing factory has to process a batch of clothes. The first workshop and the second workshop were processed at the same time for 60 days, which has just been completed. It is known that the clothing processed in the first workshop accounts for 45% of the total clothing, and the second workshop processes 132 pieces every day. How many pieces are processed in the first workshop every day?
The washing machine factory plans to produce a batch of washing machines. Results 37.5% of the plan was completed in 9 days. According to this calculation, how many days will it take to complete the plan?
7. There is a pile of coal that can be burned 120 days. Because coal-burning technology is starting a new stove, 0.25 tons of coal is saved every day. As a result, this pile of coal burned for 150 days. How many tons is this pile of coal?
8. Give Xiaoming, Xiao Qiang and Xiaogang a bag of peanuts. Xiaoming got more than 6 peanuts, Xiao Qiang got more than 9 peanuts, and the rest were given to Xiaogang. As a result, three people got the same amount of peanuts. How many peanuts are there in this bag?
9.A and B workshops process a batch of unusual parts. In this way, workshop A can process 35 pieces first, then workshop B can process 1 day first, and then workshop B can process in the initial stage. After 5 days, the number of parts processed in the two workshops is equal. So how many parts does workshop B process in a day?
10. How to divide a square into five equal parts?
1 1. At present, 10 Jin of oil is measured by one barrel 10 Jin, 1 7 Jin of a barrel and 1 3 gold cans of a barrel. Please divide this 10 kg of oil into two 5 kg, and put them in 10 kg and.
12. Grass100kg, with water content of 66%. After drying, the water content decreased to 65438 05%. How many kilograms do these grasses weigh after drying?
13. Cut one side of a square 1/5, and add 4m to the other side to get a rectangle. This rectangle has the same area as the original square. So how many square meters is the square area?
14. A workshop processes A and B parts. Among the processed parts, 30% are Class A parts, and then 24 Class B parts have been processed. At this time, Class A parts account for 25%. So how much are the two parts processed at present?
15. Party A, Party B and Party C * * * produced 1760 pieces. If A produces 2/9 less and B produces 80 more, then A, B and C produce the same number of parts. How much did A, B and C each produce?
16. Xiaoming's age this year is 65438+ 0/6 of his father's age. 15, his age is 4/9 of his father's age. How old are Xiaoming and his father this year?
17. There are 3 14 students in a school, of which 2/3 boys are 40 less than 4/5 girls. How many boys and girls are there in this school?
18. Class A and Class B have the same number of students, and some students in each class have participated in the math group. The number of people in class A who participate in the math group is exactly1/3 of the number of people in class B who do not participate in the math group; The number of people who participated in class B's math group is exactly 65,438+0.4 of the number who did not participate in class A's math group ... So, how many more people are there in class A than in class B?
19. There are several liters of alcohol solution in the container. After adding 1 liter of water, the pure alcohol content is 25%; Add 1 liter of pure alcohol, and the content of pure alcohol in the container is 40%. So how many liters of alcohol solution were there in the original container? What is the concentration?
20. Party A, Party B and Party C can finish copying a manuscript within 1 hour. It takes 80 minutes for Party A and Party B to copy together. It takes 100 minutes for Party B and Party C to copy together. How many hours will it take B to copy this manuscript alone?
2 1. A single project can be completed in 20 days; B alone can be completed in 30 days. At present, two people are working together. In Central, A stopped for three days and B stopped for a few days. It took 16 days to complete. B how many days did you pause?
22. It takes 8 hours to fill a pool of water and only open one pipe; It takes 12 hours to open only the second pipe; It takes 15 hours to open only the C tube. At the beginning of this year, only two pipelines A and B were opened, and two pipelines A and B were closed halfway, and then pipeline C was opened. It takes 65,438+00 hours to fill a pool of water. So how many hours does it take to open the C pipe and inject water?
23. It takes 12 days for an engineering team to undertake a project. If only Team A and Team B are allowed to change things, the whole project will be delayed for three days. In this way, the two teams A and B can exchange things, and the two teams C and D can also exchange things, and the whole project can still be completed as scheduled. Only let Team C and Team D exchange things, can the whole project be completed a few days earlier?
24. Team A and Team B cooperate on a project. After team A worked alone for 6 days, team B joined in and worked with team A, and it took another 4 days to complete 1/3 of the whole project. After another 10 day, the whole project was completed by 3/4. Because team A has another task, team B has been working until the whole project is completed. How many days did it take from initial stage to completion?
25. Party A, Party B and Party C took part in the bicycle race. As a result, Party A reached the finish line 24 minutes earlier than Party B and B minutes earlier than Party C. It is also known that speed A is 5 kilometers faster than speed B, and speed B is faster than speed C 1 km ... How many kilometers is the race distance between Party A, Party B and Party C?
26. On weekdays, two cars, A and B, leave from City A and City B at the same time, heading in opposite directions, and meet after six hours. One day, a car got off the road and was repaired for 2.5 hours. As a result, it took 7.5 hours for the two cars to meet. So how many hours does it take for a train to leave from city A to city B on this day?
27. In a certain city, the starting point and ending point of 104 tram are to send a tram at regular intervals and drive at a constant speed. Zhang Hua rides at an average speed along the 104 tram line. Every 12 minutes, a tram overtook him from behind, and every 4 minutes, a tram came head-on. So, 104 how many minutes does the tram take from the starting station to the terminal?
28. The walking speed ratio of Party A and Party B is 1 1: 7. The two took opposite directions from A and B, and met two hours later. Let them go in the same direction, and A will catch up with B in a few hours.
29. There are 45 students going to the suburb 30 kilometers away from the school. There is only one car in the school that can take 15 people, and the speed is 60 km/h. The speed at which students walk is 4 kilometers per hour. In order to get them to the work place as soon as possible, they need at least a few hours to arrive in detail.
30. The students of Class A and Class B leave school at the same time and go to the Children's Palace. The walking speed of Class A is 5 kilometers per hour, and that of Class B is 6 kilometers per hour. There is a car in the school that can just take a class of students. This car travels 30 kilometers per hour. In order to let the students of the two classes arrive at the Children's Palace as soon as possible, what should be the walking distance ratio between Class A and Class B?
3 1. A car from place A to place B can arrive 1 hour earlier than the original time by increasing its speed by 20%. Drive at the original speed120km, and speed up by 25%, so you can arrive 40 minutes earlier than the original time. How many kilometers is the distance between A and B?
32. There is an expressway from City A to City B, sharing three sections, the first section of which is twice as long as the third section. On the first section of the road, the speed of the car is 40 kilometers per hour; On the second section of the road, the speed of the car is 90 kilometers per hour; On the third road, the speed of the car is 50 kilometers per hour. At present, two cars are leaving from A and B at the same time, and1/will meet at the second section 1/3 (1/3 from A to B) in 20 minutes. So how many kilometers is it between A and B?
33.A car and B car leave from A to B at the same time. After driving at the original speed of 2/3 of the whole journey, the speed of car A increased by 1 times, and the result was that it arrived at place B two hours earlier than originally planned. The speed of car B has been increased by 1 times after driving at the original speed of 30 km/h/4. As a result, the two cars arrived at B at the same time. So how many kilometers does A plan to drive every hour?
34. There are long-distance buses running at a firm speed between A and B cities. If the speed is 6 kilometers faster than the original speed, you can arrive 20 minutes earlier. If the speed is 5 kilometers slower than the original speed, then you have to leave 24 minutes earlier. How many kilometers is the distance between A and B?
35. In a metropolis, the bus departure time is fixed. Xiaoming is on his way home after school. He found a bus coming from behind him every six minutes and a bus coming from behind him every two minutes. He wants to know how many minutes the bus will leave. Can you help him calculate it?
36. The distance between Party A and Party B is 240 kilometers. The speed of the car from Party A to Party B is 36 kilometers per hour, and the speed of the motorcycle from Party B to Party A is 24 kilometers per hour. 2.5 hours after the motorcycle leaves from Party B, the car also leaves from Party A. How many hours after the car leaves?
37. In order to meet the increasing demand of water consumption, three water plants, A, B and C, have been newly built in Kunming recently. The total daily water supply of these three water plants is 1 1.8 million cubic meters, of which the daily water supply of water plant B is three times that of water plant A, and that of water plant C is 1.8 million cubic meters, which is more than half of that of water plant A.. What is the daily water supply of these three water plants?
38. Party A and Party B are shareholders of a company, with Party A accounting for 60% and Party B accounting for 40% of the shares. After that, they decided to take in Party C, so Party C gave Party A and Party B RMB 6,543,800+0.8 million, reducing their shares to 35%, with Party C accounting for 30%. How much should both parties get back?
39. There are five questions in an exam. 1, 2, 3, 4, 5 account for 8 1%, 9 1%, 85%, 79%, 74% of the participants, so what is the maximum passing rate of this exam?
40. List three numbers from 0 to 9.
1) So each number can only be used once. How many possibilities are there?
2) If each number can be used several times, how many possibilities are there?
4 1. It's 4: 05. How many minutes will it take for the hour hand and minute hand to coincide for the first time?
42. Football match 1 round (each team 1 1 game), if you win a game, you will get 2 points, if you draw a game, you will get 1 point, and if you lose a game, you will get 0 point. The number of times a team loses is m2/ 1. * * 14.
43. A test paper has ***25 multiple-choice questions. Answer correctly 1, get 4 points, answer incorrectly or don't answer, get 1 point. A student got 90 points in the exam. How many questions did you answer correctly? At present, there are 500 students taking the exam. Did anyone get 83 points? Why?
44. The basic cost of electricity for a city resident is 0.40 yuan per kWh. If the monthly electricity consumption exceeds one kWh, the excess will be exempted at 70% of the basic electricity price. (1) A household used 84 kwh of electricity in May, and * * * paid 30.72 yuan to find a. (2) If the household's average electricity bill in June was 0.36 yuan per kwh, how many kwh did the household use in June and how much should it pay?
45. Zhang Ping has 500 yuan and plans to take it out and deposit it in the bank for two years. There are two ways to deposit, one is to deposit for two years with an annual interest rate of 2.43%; One is deposit 1 year with an annual interest rate of 2.25%. At the time of 1 year, the principal and after-tax interest are taken together, and then taken out at 1 year. Which method can I choose to get more after-tax interest?
46. Three fives plus one 1, addition, subtraction, multiplication and division, get 24.
47. There is a Pentagon, and each vertex is painted with one of three colors: yellow, red and green. I find that the vertex colors of adjacent conditions are different. How many ways are there?
48. There is a two-story bookshelf. The number of books in the lower level is 2.5 times that of the lower level, and the number of books in the lower level is just right. How many books are there on two floors?
49. After Party A and Party B broke up, they walked in opposite directions along the railway tracks. At this time, a train is coming to Party A at a uniform speed, and the train passes by Party A, which takes 15 seconds. Then I passed by B, and it took 17 seconds. Given that the walking speed of two people is 3.6 km/h, how long is this train?
50. Li Bai walked in the street doing nothing, carrying a hip flask to smash wine. I met a store and doubled it. When you see flowers, you can come to a barrel (barrel, a modern vessel for holding wine). Spend three times in the shop and finish the wine in the pot. How much wine is there in the pot?
5 1.A Reservoir * * * has two inlet pipes AB and a drain pipe C. Pipe A can be opened separately, and the empty pool can be filled in 6 hours, and B can be closed separately. Empty pool 10 hour can be filled with water, and full pool can be emptied in 9 hours. There is no water in the pool at present. If the AB pipe is opened for 2.5 hours at the same time, how many hours can the pool be filled with water after the C pipe is opened?
52. A three-digit number is 4. Change 4 to the far left and you get 98 times the original number. What is the original number?
53. If you learn isphadeciond * e = dcba, what is learning isphadeciond?
Learning isphadecision * 4 = dcba
Learning isphadecision * 9 = dcba
54. Party A and Party B set out from A and B at the same time and face to face. When they set off, their speed was 3: 2. After their first meeting, Party A's speed increased by 20% and Party B's speed increased by 30%. In this way, you will know the composition counseling for the sixth grade of primary school. When A arrives at B, B is still 14 km away from A, so what is the distance between A and B?
55. 1/28 is expressed as the sum of two different decimal units. How many different expressions are there for * * * (only considering different summation laws as one)?
56. Nine prime numbers have been filled in the table below. Adding three numbers in the same row or column to the same natural number is called a list. Q: Can you decide how many times to list them so that all nine numbers in the table become the same number? Why?
2 3 5
13 1 1 7 ← This is the original list of tabular graphs.
17 19 23
57. Any three integers are multiplied by every two of A.B.C., and the sum of the products is odd, so what is the maximum number of odd numbers in A.B.C.?
58. There are two things, A and B. It takes Zhang 15 days to complete A, Li 15 days to complete A and Li/20 days to complete B, so both things can be completed by two people. How many days does it take to complete these two things at most?
59. Use 1 cent, 2 cents and 5 cents to make a dollar. * * * How many different ways are there?
60. Find three consecutive natural numbers, so that the smallest number is a multiple of 15, the largest number is a multiple of 19, and the other number is a multiple of 17. What is the minimum sum of three consecutive numbers?
6 1. What is the smallest natural number that satisfies divisor 3, divisor 4, divisor 5 and divisor 6?
62. There is a score with the smallest denominator, which is greater than 1/2005 and less than 1/2004. What is this score?
63. The total expenditure of running a factory in a middle school is 40,000 yuan more than the total expenditure. It is planned that the total expenditure is greater than the total expenditure this year. If the total expenditure plan for this year is increased by 65,438+05% compared with last year, the total expenditure will be reduced by 5% compared with last year.
64. When a store sells a commodity, the cost of technetium increases from M% to (M+6)%, because the purchase price drops by 5%. What is the value of m?
65. There are three piles of chess pieces, each pile has the same number of chess pieces, and there are only two colors of chess pieces. The number of sunspots in the first group is as much as that in the second group in Bai Zi, and the ratio of sunspots in the third group to specific sunspots is 3:8. If these three pieces are put together, what is the ratio of Bai Zi to specific pieces?
66. When buying two books, A and B, the unit price ratio is 7:5:6, and the ratio of A to quantity is 5:6. A book is more expensive than B book, 20 yuan. How much does it cost to buy B books?
67. Two sentries looked at each other from A and B at the same time. They met for the first time at a distance of 70 kilometers, and they still marched at the original speed. They went there immediately, and the second meeting was at a distance of b 15 kilometers. How many kilometers are the two places apart?
68. Two workers, Party A and Party B, processed a batch of parts together and finished the task in 20 days. It is known that A makes three more pieces than B every day, and B takes five days off, so the number of parts completed by B is exactly half that of A. What is the total number of these parts?
69. Spiders have eight legs and dragonflies have six. There are several spiders and dragonflies. They have 120 legs. The number of dragonflies is twice that of spiders. Q: How many spiders and dragonflies are there?
70. A is seven times as old as B this year. After 15, A is twice as old as B. How old is B this year?
7 1. A square pond with a big tree at each corner. Some people want to double the pond area without affecting the growth of big trees, and it is still square. Do you think it's possible? Please draw the added prompt diagram by enabling it.
72. There are 36 more workers in workshop A than in workshop B. At present, there are 12 workers transferred from workshop B to workshop A, and there are 2/3 fewer workers in workshop B. How many people are there in workshop A?
73. There are 20 workers in a workshop, each of whom processes 5 A parts or 4 B parts every day. Of the 20 workers, X people were sent to process A parts, while others processed B parts. It is known that every part of 1a can obtain 16 yuan, and every part of 1b can obtain 24 yuan.
1. The daily cost of the workshop is expressed by an algebraic expression containing X. 。
2. If 7 people are sent to process Part B, do you think it can complete the daily profit 1800 yuan cost plan? Comment on your prejudice.
How many grams of salt is added to 74.300 grams of brine with a concentration of 15% to become 18%?
75. Party A, Party B and Party C get off the bus from A to B, and Party A13 gets off the bus all the way, and Party B gets off 2/3 all the way. Party C gets on the bus at Terminal B, and Party C pays the fare to 90 yuan. How should Party A, Party B and Party C share the fare?
76. In 2003, add its 1/2 to get a number, add its 1/3, this time add its 1/4 to get another number, ... and so on until the last number is 1/65438+.
77. My mother gave Xiaoming 19 apples in the test of Xiaoming's practice, and asked Xiaoming to give dividends to Sidui. After begging for conditional points, she asked him to double the first pile, add one to the second pile, cut off two from the third pile and double the fourth pile. The number of apples in these four piles should be the same. How does this 19 apple get dividends?
78. This year is 2006. Parents are 70 years old, younger brother and sister 16 years old. By 2009, my father is four times older than my brother, and my mother is three times older than my sister. So, when the father is twice the age of his sister, what year is it?
The incomplete quotient of 79.2000 divided by the natural number is 46, so the natural number is () and the remainder is ().
80. There are three consecutive even numbers with two digits, and the sum of their digits can be divisible by 7. The minimum sum of these three numbers is ().
8 1. Party A and Party B jog back and forth on the straight track, with a distance of 100 meters. Party A runs 2 meters per second and Party B runs 2.4 meters per second. They started at both ends of the straight and jogged for 30 minutes, during which they met () times.
82. For a pile of oranges, every 10, there are eight more copies and every 13, there are seven fewer copies. How many oranges are there in this pile?
83. The sum of a two-digit number, a one-digit number and a ten-digit number is 12. If one digit and ten digits are exchanged, the new number is 36 larger than the original number. What are the original two digits?
84. 1) Please write the sum of prime numbers not exceeding 30 in the nature book.
2) Please reply. How many even natural numbers * * * are there in 1?
3) The thousands of four even natural numbers are 1. When it is divided by four different prime numbers, the remainder is also 1. Try to find all the natural numbers that meet these conditions. What is the biggest one?
85. In a private school, 1 000 students took the drop-out exam, and 1 000 students were admitted. The difference between the average scores of admitted students and those who were not admitted was 38 points. The average effect of all candidates is 55 points, and the admission score is 6.3 points less than that of students. What is the admission score?
86. A pool is equipped with three water pipes, the first one is the water inlet pipe; The second pipe is an outlet pipe, which can fill a pool of water in 20 minutes; The third pipe is also an outlet pipe, which can drain the water in the pool within 30 minutes. At present, the first pipe is opened, and the second and third pipes will be opened when the water in the pool just overflows. It took 18 minutes to completely drain the water in the pool. In this case, how many minutes does it take to drain the pool after opening tube A and then opening tube B instead of tube C?
87. There are 42 workers in the packaging factory, and each worker can produce 120 round iron sheets or 80 rectangular iron sheets per hour on average. Two circular iron sheets and a rectangular iron sheet can be made into a sealed cylinder. How to reasonably match iron sheets according to workers' skills?
88. Project A needs 10 days to complete, one person needs 15 days to complete, and one person needs 20 days to complete. In the initial stage, three teams cooperated, and the latter team was transferred to do other things. It will take 6 days for the specific matters. If Team A is set to participate in X days, then the number of days that Team A participates can be listed in equation _ _ _ _ _.
89. One digit is three digits of 4. If you change this number to the left by 4, you will get 98 times the original number. If the mantissa 4 is removed from this three-digit number and the remaining two digits are X, then the countable equation of the original number is _ _ _ _ _ _ _ _ _ _ _.
90. A student rides from school to the railway station, and B student rides back to school from the railway station. A is 2 kilometers faster than B by bike, and both of them leave at 8: 00 in the morning, 36 kilometers away from 10 in the morning and 36 kilometers away from 1 at noon. Please ask about the distance from the school to the railway station.
9 1. When is the hour hand and minute hand of a clock between 3 o'clock and 4 o'clock 1: Coincidence 2: at right angles 3: at right angles.
92. How many non-repeating seven digits composed of seven numbers can be divisible by 1 1?
93. Xiaoli went out for a walk at 6 o'clock in the evening and saw that the angle between the hour hand and the minute hand of the clock was 1 10 degrees. When she got home before 7 o'clock, she saw that the angle between the hour hand and the minute hand was still 1 10 degrees. How long did Xiaoli stay outside? ~
94. How many acute angles can a set of triangles spell at most?
95. A batch of books were donated to schools in mountainous areas, and110 and 6 copies of these books were donated to Qingshan Primary School as planned. Other departments gave it to the Children's Palace, and 136 copies were given to the Children's Palace, which was three times more than that given to Qingshan Primary School. And the remaining 75% and 80 copies of the second time were given to Chunmiao Kindergarten; Finally, there are 300 books left, which will be used as prizes in the mathematics competition of primary schools in mountainous areas. * * * How many books have you donated?
96. Class 6 (2) scored an average of 78 in a math exam. It is known that the average score of boys is 75.5 and that of girls is 8 1. What is the ratio of boys to girls in this class?
97. There are 86 workers in a factory. It is known that each worker does not need 15 A-shaped parts or 12 B-shaped parts or 9 C-shaped parts, but 3 A-shaped parts, 2 B-shaped parts and 1 C-shaped parts are just matched into 1 set. How can we control the workers to make the processed parts match?