2. There are three grasslands with an area of 5 15 and 24 mu respectively. The grass on the grass is as thick and grows as fast. The first meadow can feed 10 cows for 30 days, the second meadow can feed 28 cows for 45 days, and how many cows can the third meadow feed for 80 days?
3. Party A and Party B contract a project. It can be completed in 4 days and needs to pay 1800 yuan; Contracted by Team B and Team C, it can be completed in 3+3/4 days, and it needs to be paid 1500 yuan; 2+6/7 days, cost 1600 yuan. On the premise of ensuring the completion within one week, which team should be selected for the lowest cost?
A rectangular iron block is placed in a cylindrical container. Now turn on the tap and pour the water into the container. In 3 minutes, the water just passed the top of the cuboid. In another 18 minutes, the water has filled the container. It is known that the height of a container is 50 cm and the height of a cuboid is 20 cm. Find the ratio of the bottom area of a cuboid to the bottom area of a container.
5. Two bosses of Party A and Party B buy a piece of fashion at the same price, and Party B buys 1/5 sets more than Party A, and then Party A and Party B sell them at profit margins of 80% and 50% respectively. After both of them were sold out, A still made more profits than B, just enough for him to buy 10 this fashion. How many sets of this fashion A did you buy?
6. There are two water pipes A and B, and water is injected into two pools with the same size at the same time. At the same time, the water injection ratio of A and B is 7: 5. After 2+ 1/3 hours, the sum of water injected into pools A and B is exactly one pool. At this time, the water injection rate of pipe A is increased by 25%, while the water injection rate of pipe B is unchanged. So, how many hours does it take for pipeline A to fill pool A and pipeline B to fill pool B?
Xiao Ming walks from home to school in the morning. When he ran halfway, his father found that Xiao Ming's math book was left at home, and then he rode to deliver it to Xiao Ming. When he caught up, Xiao Ming still had 3/ 10 to go. Xiao Ming got on his father's car at once and was sent to school by his father, so Xiao Ming arrived at school five minutes earlier than walking alone. How long does it take Xiaoming to walk from home to school?
8. Both A and B start from place A and pass through place B to place C. The distance between A and B is equal to the distance between B and C. The speed of car B is 80% of that of car A. It is known that car B starts earlier than car A 1 1 minute, but it stops at place B for 7 minutes, while car A continues to drive to place C. Finally, train B is faster than car A. Then car A will overtake car B a few minutes after car B leaves.
9. Party A and Party B have two cleaning vehicles to clean the road between things. It takes 15 hours for car A to clean alone, and 15 hours for car B to clean alone. Two cars leave from East and West at the same time. When they met, car A cleaned more than car B 12 kilometers. How many kilometers is there between East and West?
10. There are 4 containers today, weighing 3 tons and 2 tons respectively. Five 5-ton containers with a weight of 1. 5-ton container 14, 7 weight 1 ton container. How many cars do you need at least? The load capacity is 4. Can a 5-ton car transport all the containers at once?
1 1. Both the master and the apprentice * * * processed 170 parts, and the number of parts processed by the master was 1/3 more than that processed by the apprentice, so how many parts did the apprentice process?
12. Both a big car and a small car drive from A to B. The speed of the big car is 80% of that of the small car. It is known that the bus leaves earlier than the car 17 minutes, but it stops at the midpoint of the two places for 5 minutes before continuing to the second place; However, after the bus set off, it didn't stop halfway, and went straight to B. Finally, the bus arrived at B 4 minutes earlier than the bus. It is also known that the bus departs from a place at 10 in the morning. So when did the bus catch up with the bus in the morning?
13. For a manuscript, it takes 14 hours for A to type alone, and 20 hours for B to type alone. If Party A calls 1 hour first, then Party B replaces Party A 1 hour, and then Party A replaces Party B 1 hour. . . . . . . Two people work alternately like this. So how many hours will it take Party A and Party B to finish this manuscript?
1There are 3 yellow balloons in 4.2 yuan and 2 flower balloons in 3 yuan. The school * * * bought 32 balloons, 4 of which were fewer than yellow balloons. What balloons do schools spend more money on?
15. The sailing speed is 60m/min. In a river with a current speed of 20 meters per minute, the ship travels from the upstream port to the downstream place, and then returns to its original place. * * * How many meters did the ship walk from the upstream port to the downstream in 3 hours and 30 minutes?
16. Granary A contains 43 tons of flour and Granary B contains 37 tons of flour. If the flour from granary B is loaded into granary A, the remaining flour after granary B is full accounts for 1/2 of granary B's capacity. If the flour from granary A is put into granary B, after granary B is full, the remaining flour from granary A accounts for 1/3 of granary A's capacity. How many tons of flour can each granary hold?
17.A divided by B, B divided by C, the quotient is equal, the remainder is 2, and the sum of A and B is 478. So what is the sum of a, b and c?
18. A car goes from A to B. If you reduce the speed by 10%, you will arrive 1 hour later than the original time. If you drive at the original speed of 1 80km and increase the speed by 20%, you will arrive1hour earlier than the original time. What is the distance between a and b?
19. A school participated in the military training queue performance competition and organized a phalanx team. If there are 60 students in each class, this phalanx must have at least 4 students; if there are 70 students in each class, this phalanx must have at least 3 students. So how many people should this phalanx consist of?
20.a, B and C lathes process square and round parts. It is known that two out of every three parts machined by lathe are round; Three out of every four parts machined by lathe B are round; Four fifths of the parts processed by C lathe are round. On this day, the three lathes * * * processed 58 round parts, and the ratio of the number of square parts processed was 4: 3: 3. So how many parts were processed by the three lathes * * * on this day?
2 1. The length of the circular metal wire is 30m. Three metal wires with length A and five metal wires with length B are intercepted. If two metal wires with length B are intercepted, the remaining metal wires are still less than 0. 4 meters, if you intercept two more metal wires with a length, you will lose 2 meters. How many meters is the length a equal to?
22. A company wants to transport two kinds of building materials, A and B, to the construction site. Building materials A weigh 700kg each, * * has 120 pieces, building materials B weigh 900kg each, and * * has 80 pieces. It is known that a car can transport up to 4 tons at a time, so how many times do five identical cars have to be transported at the same time?
23. The distance from Wang Lijia to the school is longer than the distance to the gymnasium 1/4. One day, Wang Li watched the game in the gym and walked home in 17 minutes. After a short rest, it took him 25 minutes to walk to school, which was slower than coming back from the gym 15 meters. How far is it from Wang Lijia to school?
24. Master and apprentice cooperate to complete a project. Because of their good cooperation, the master's work efficiency is higher than that of the apprentice110 and higher than that of the apprentice 1/5. Two people worked together for six days, completing two-fifths of the whole project, and then the apprentice worked alone for six days. At this time, the project still has 13/30 unfinished. If the project is done by the master alone, how many days will it take to complete?
25. Students in five classes of Grade Six planted 100 trees. It is known that the number of trees planted in each class is different, and the order from more to less is exactly 1, 2, 3, 4 and 5 classes. It is also known that the number of plants in class one is the sum of the number of plants in class two and class three, and the number of plants in class two is the sum of the number of plants in class four and class five. So how many trees can Class Three plant at most?
26. A runs 13 km per hour, B runs 1 1 km per hour, and B runs 20 minutes longer than A. As a result, B runs 2 km longer than A. How many kilometers did Manager B run?
27. There are two cylindrical containers, A and B, with the same height, and the inner mouth radii are 6 cm and 8 cm respectively. Container A is full of water and container B is empty. Pour all the water in container A into container B, and the water depth in container B is 2 cm lower than 7/8 of the container height. How many centimeters is the height of this container?
28. The cargo 104 tons is transported by 9-ton truck. It is known that a car needs 1 hour for each round trip. In fact, every time the car is loaded 1 ton, it can be completed a few hours in advance.
29. On the first day, master and apprentice processed 225 parts, and on the second day, new technology was adopted. The number of parts processed by the master increased by 24% compared with the first day, and the number of apprentices increased by 45%. Two people processed 300 parts. How many parts did the master process the next day? How many parts did the apprentice process?
30. Struggle Primary School organizes sixth-grade students to go camping and training in Baihua Mountain, and the journey is increased by 2 kilometers every day. I went for four days and came back for three days. How many kilometers is the school from Baihua Mountain?
1. Machine tool factory produced 400 machine tools in April, an increase of 23% in May compared with April. How many units will be produced in April and May 1 day?
2. Build an 800-meter canal. How many meters are left?
3. Grade six students actively participate in interest group activities, and there are 30 students in the Chinese group, accounting for the total number of grade six students. The number of students participating in the math group accounts for the total number of sixth-grade students. How many people are there in the math group?
There are 360 peach trees, pear trees and apple trees in the orchard, of which peach trees account for 5: 3. How many trees are there in each of the three trees?
5. There are three barrels of oil, A, B and C, with 6.6kg in barrel A and 5.8kg in barrel B.. If the weight difference between barrel A and barrel B is equivalent to barrel C, what is the weight of barrel C?
6. The ratio of Xiao Wei and Xiaoying's donation to Project Hope is 2 :5. Xiaoying donated 35 yuan. How much did Xiao Wei donate?
The TV factory plans to increase its output by 30% this year compared with last year. Last year, we produced 1.5 million TV sets. Tens of thousands of TV sets are planned to be added this year?
8. A village wants to dig a 2700-meter-long canal, and has already dug 1.050 meters. How many meters does it take to dig this canal?
9. Young Pioneers in a school collected 85 kilograms of tree species in the fourth grade, and the fifth grade was more than the fourth grade 10 kg, and the sixth grade collected the fifth grade. How many kilograms of tree species were collected in the sixth grade?
10. The warehouse transported 240 tons of rice, and the soybeans transported were tons of rice and tons of flour. How many tons of flour were delivered?
1 1.5: 3 Send a batch of goods to Team A and Team B. If Team A completes the task, the rest will be delivered to Team B, who will deliver 48 tons. How many tons are there in this shipment?
12.75 mu of land, 24 mu in the morning and 26 mu in the afternoon. How much of this land has been reclaimed? How much is left?
13. Wang deposited 500 yuan in the bank for one year, and the principal and interest will be 536 yuan at maturity. What is the annual interest rate？
14. The speed of the train is 60 kilometers per hour, and the speed of the car is the speed of the train. How many kilometers is the car slower than the train per hour? How many kilometers does this car travel per hour?
15. Uncle Zhang deposited 2000 yuan in the bank, with a fixed term of one year and an annual interest rate of 8.64%. How much principal and interest can he receive at maturity?
16. The cost of a product produced by a factory is 37.4 yuan, which is lower than the original 15%. What is the original price of each piece?
17. Xiao Li produced 240 machine parts, 20% less than planned. How many parts does Xiao Li have to make to exceed 25%?
18. Xiao Ming read a book. On the first day, he read 20% of the whole book, the next day he read 25%, and on the third day he read 12 pages, which is just half of the whole book. How many pages are there in this book?
19. Xinhua Bookstore sold a batch of children's books. After 80% of them were sold, 745 books were shipped back, so there are 25 more books in existence than sold. How many children's books are there?
20. To produce 240 parts, 25% will be completed within 5 hours. At this rate, how many hours will it take to produce the rest?
Judge.
1. The flour yield of a wheat is 103%. ( )
2. The attendance rate of employees in a factory in March 1 day was 96%, and the absenteeism rate was 14%. ( )
3. Among the students in Class Five (1), 47% are boys and 5 1% are girls. ( )
There are 8 boys in one class, 10 girls, and the male-female ratio is 0.8. ( )
5. Party A and Party B walk on the same road at the same time. Party A walks for 20 minutes and Party B walks for 30 minutes. The speed ratio of Party A and Party B is 2: 3. ( )
6. On the map with the scale of 8∶ 1, the line segment of 2 cm represents the actual length of the part of 16 cm. ( )
7. The perimeter ratio of two circles is 2∶3, and the area ratio is 4∶9. ( )
8. The perimeter ratio of two circles is 1: 3 and 1: 9. ( )
1. Xiaohui bought a New Year card of 10. She spent 50 cents of 5 yuan's money on some New Year cards and postcards.
Class 2.6 1 46 people went for an autumn outing, and * * * rented a boat 12. There are five people in the big boat and three people in the small boat, and each boat is full. How many boats did you rent? (Equation solving)
3. There are 45 tricycles and four-wheeled vehicles in the parking lot of the sanitation department, and the total number of wheels of the two vehicles is 155. How many tricycles and cars are there in this parking lot?
Students play fixed-point shooting games. Xiaofeng 10 shot, scored 26 points. It is stipulated that for every vote of 5 points, the missing vote is 1 point. How many shots did Xiaofeng shoot?
Xiao Ming has 50 2-cent coins. He changed these coins into nickels of 16. How many pence does Xiao Ming have?
6. The scoring method of football league is to win a game with 3 points, draw a game with 1 point, and lose a game with 0 points. A team played 12 games, 6 of which lost, and * * * got 16 points. How many games did the team win?
7. In China, it is a famous and interesting math problem to keep chickens and rabbits together. The Art of War was first recorded about 1500 years ago. Would you please answer in your favorite way? Now chickens and rabbits live in the same cage, with 35 heads on the top and 94 feet on the bottom. The geometry of chicken and rabbit? '
8. Xiaodong's mother received 80 400 yuan prizes from the company, including 2 yuan, 5 yuan and 10 yuan RMB * *, 5 yuan and 10 yuan RMB with the same amount. How much are these three kinds of RMB?