2. Build a 200-meter-long canal, which has been built for 80 meters. How many meters will it take to repair three-fifths of the canal?
3. A book has 600 pages. I saw 1/4 on the first day and 2/5 on the second day. How many pages have I read in two days?
Ada Garden Primary School donated money to Hope Project. Class 6 (1) donated 1/3 for the sixth grade, and 1/4 for the whole school for the sixth grade. The whole school donated 2400 yuan. How much did Class 6 (1) donate? (Answer in two ways)
5. The distance between Party A and Party B is 60km, and the car goes from Party A to Party B. When the car exceeds the midpoint of the whole journey10km, what fraction of the whole journey remains?
Last year, the school planted 120 trees. This year, there are 5 more trees than last year's 3/4. How many trees will be planted this year?
7. The school planted 120 trees this year, 5/3 more than last year. How many trees were planted last year?
8. A basket of apples was sold in half for the first time and 4/5 for the second time. How many apples have not been sold in this basket?
9. A table tennis ball falls from a height of 25 meters, and the height of each rebound is 2/5 of the falling height. How many meters can you bounce back after the fourth fall?
10. A batch of garment processing tasks are allocated to workshops A and B according to the ratio of 4: 5. Workshop A actually produced 450 units, which exceeded the assigned task of 1/4. How many sets of clothes are there?
1 1. In July of a certain year, rainy days were 2/3 of sunny days and cloudy days were 2/5 of sunny days. How many days are there sunny this month?
12. The shopping mall * * *1380m has white cloth, blue cloth and printed cloth. The rice ratio of white cloth to printed cloth is 5: 6, and the rice of printed cloth is 3/2 times that of blue cloth. How many meters are there in each of the three fabrics?
13, three groups of students collect tree species, and the working efficiency ratio of group A, group B and group C is 5∶3∶4. Group A received 15 Jin, but how much Jin did Group B receive less than Group C?
14, number A is 3/5 of number B, number C is 2/3 of number A, and number C is a fraction of number B?
15, each tractor plows 5/7 hectares per hour, and how many hectares does 8 tractors plow in 45 minutes?
16, a rope, cut its 1/2 for the first time, the remaining 1/3 for the second time, and the remaining 1/4 for the third time. How much rope is left?
17. The proportion of cement, yellow sand and gravel in concrete is 2: 3: 5. If there are 3/4 tons of cement mixed with concrete, how many tons of yellow sand gravel are needed?
18, Xiaohong finished reading 2/5 of a book in 8 days, and prepared to finish reading the rest in 6 days. How many points does she read this book on average every day?
19, a book with 640 pages, I read 3/8 in three days. How many days does it take to finish reading this book at this speed?
On an 800-kilometer road, a car covered three-fifths of the distance in six hours. How many hours does it take to complete the race at this speed?
2 1, Xiaohong took out 4/7 of the money herself, Xiaoli took out 3/5 of the money herself, and they bought the same dictionary. It is known that Xiaohong originally had 2 1 yuan, so how much did Xiaoli want?
22. There is a batch of chemical fertilizers in the warehouse, and 4/7 of them are distributed to Wangcun and Zhang Cun according to the ratio of 5: 3. It is known that Zhang Cun is 4.8 tons less than Wangcun. How many tons is this batch of fertilizer?
23. The number of girls in Class 1 (2) of Xinhekou Primary School accounts for 5/6 of the number of boys. After transferring two girls, there are still 42 students in the class. What is the ratio of girls to boys now?
In a math exam, the average score was 78. 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?
25. A glass of salt water is 200g, and the ratio of salt to water is 1: 24. If you add another 4 grams of salt, what is the ratio of salt to water?
26. A factory 120 people, and B factory 80 people. How many people are transferred from Factory B to Factory A, so that the ratio of the two factories can reach 5∶3?
27. A canal with a length of 1.800 meters was built. After five days of work, the ratio of the repaired length to the unrepaired length was 1∶3. According to this schedule, how many days will it take for the canal to be completed?
28. The speed ratio of car to truck is 4: 7. Two cars driving from two places at the same time meet at the midpoint15km. How many kilometers did the train travel at this time?
29. An airplane flies 720 kilometers per hour, and it takes 3/4 hours to cover 2/7 of the whole journey. How many kilometers is the whole journey?
30. Master Wang processes a batch of parts in 6/7 hours 12 pieces. According to this calculation, how many hours will it take to process 144 parts?
3 1. To build the canal, 2/ 1 1 of the total length has been built, and then160m was built, and 400m was built twice. How long is this canal?
32. To build a road, the ratio of the completed road to the total length is 1: 3. If 150m is built, half of this road can be completed. How long is this road?
33. There are 585 boys and 540 girls in Guangxin Primary School, and the number of chorus accounts for 4/45 of the whole school. After transferring 20 people to join the dance team, the remaining people are just 8/ 17 in grade six. How many people are there in the sixth grade?
34. A basket of fish is 43kg, which is sold at 1/3 and then sold at 5kg. At this time, the fish in the basket weighs 25 kilograms. How many kilograms is the fish basket?
35. Xiaoming reads a science fiction novel with a page of 144. The ratio of read pages to unread pages is 5: 3. Then I read 12 page. How much is left?
36. A book has 360 pages. Read 1/4 on the first day and the remaining 2/3 on the second day. How many pages are left?
37. There are 94 tons of chemical fertilizers in the east and west warehouses, of which 2/5 are shipped from the east warehouse and more than 2/5 are shipped from the west warehouse. At this time, there are still 10 tons in Dongcang and several tons in Xicang.
38. The cost of a commodity this year is higher than that of last year110, but the original selling price is still maintained, so the profit of each commodity is reduced by 2/5. So what is the cost of this commodity this year?
39. The chemical fertilizer plant 1 month produced 250 tons of chemical fertilizer, and then every month increased by 1/5 compared with the previous month, so it completed 5/ 12 of the planned annual output in the first quarter. How many tons of chemical fertilizer does this factory plan to produce throughout the year?
40. Students in Grade 5 and 6 went to plant trees. Students in grade five plant two-thirds of those in grade six. The number of trees planted in the sixth grade is 24, less than 3/4 of the total. How many trees were planted in the fifth grade?
4 1, team a and team b build a road, team a 12 days, team b 10 days, now team a builds a few days, and the rest is repaired by team b alone. As a result, when it was completed, A worked more than B 1 day, and how many days did B repair it?
42. Two cars, A and B, left relatively from AB at the same time, and met 40 kilometers from the midpoint a few hours later. It is known that it takes 8 hours for a car to complete the journey, and it takes 10 hour for a car to complete the journey. How many kilometers are there between AB?
43. It takes 65,438+02 days for two teams to complete a project. Now Team A is working alone for 65,438+08 days, and Party B will do the rest, and it will be completed in 8 days. How many days will it take if Party A does this project alone?
44. A pool is equipped with three water pipes, one of which is a 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. Now, open the first pipe first, and wait until the water in the pool just overflows, then open the second and third pipes. It took 18 minutes to 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?
45. Jiedao invested 420,000 yuan to implement the poverty alleviation plan this year, more than last year 1/2. How much did it invest last year?
46. The workshop director assigned Master Huang 320 parts, which should be completed within 10 hour. If Master Huang processes 3/8 of the total parts in 3 hours. According to this calculation, can Master Huang finish the task within the specified time? Why?
47. 300g of salt water with a salt content of110. How many grams of salt do you need to add to become salt water with a salt content of 1/4?
48. If the teams of Party A and Party B work together, a project can be completed within 10 days. If Team A works for 4 days and Team B works for 6 days, 7/ 15 of this project will be completed. How many days does Group A need to do this project alone?
49. A batch of books were distributed to students A, B and C. A got 1/5 and 5 of the total, B got 1/4 and 7 of the total, and C got 1/2 of the remaining books, which just accounted for 1/8 of the total. How many books are there in this batch?
50. Build a road, and the number of meters repaired is 3/2 of the number of meters not repaired. If you build another 30 meters, the ratio of the number of meters repaired to the number of meters not repaired is 7: 3. How many meters is this road?