2. The table top of the table tennis table is a rectangular plate with a length of 274 cm, a width of 2.5 cm and a thickness of 2.5 cm. If this kind of wood is 0.4 kilograms per cubic decimeter, how many kilograms does the desktop weigh? (The number shall be kept to one decimal place)
A swimming pool is 60 meters long, 35 meters wide and 2 meters deep. How many tiles of 40cm×40cm are needed? How much is a square meter of tile in 85 yuan?
4. A warehouse paints the walls. This warehouse is 50 meters long, 40 meters wide and 5 meters high. The area of doors and windows is about 50 square meters. What is the wall area to be painted in this warehouse? Under the condition of no loss, using 0.8 liters of paint per square meter, there is a loss of 1/8 in actual painting. How many liters does the paint warehouse actually need?
The bathroom is 3 meters long, 2.5 meters wide and 2.8 meters high. Window height 1 m, width1.4m, door height 2m, width 0.8m.. How many square meters of tiles and floor tiles do you need to buy?
6. To paint an 80-square-meter wall, you need to paint it twice. Under the condition of no loss, 0.6 liter of paint is needed per square meter. The second painting used 5/8 of 1 painting, and the actual painting lost about 5 liters of pigment. * * How many liters are needed?
7. In a rectangular glass jar with a length of 50 cm and a width of 40 cm, put a cubic iron block with a length of 10 cm and a depth of 20 cm. If the iron block is taken out, how many centimeters deep is it in the jar?
8. An uncovered cuboid water tank is 2m long, 8m wide and 6m high. How many square decimetres of iron sheet does it take to make this water tank? How many liters of water can I hold at most?
9. Every 50,000 pairs of disposable chopsticks need 1 tree, and each tree can absorb110 kg of carbon dioxide every day. A restaurant receives about 65438+ ten thousand people a year. If each guest uses a pair of disposable chopsticks on average, how many kilograms of carbon dioxide will be absorbed less every day?
10. There are 600 books in shelf A, and shelf A borrowed13. After borrowing 3/4, there are twice as many books in shelf A as in shelf B. How many books are there in shelf B?
1 1. Human blood accounts for about113 of human body weight, of which about two-thirds is water, with a warm and warm body weight of 39 kg. How many kilograms of water is there in her blood?
12. A company wants to repair a batch of computers. 1/3 has been repaired, and 24 computers have been repaired, which is exactly half of the computers. How many computers are there?
13. There are 420 peach trees in the orchard, 2/5 more than apple trees. How many peach trees are there than apple trees?
14. The garment factory processed 1200 sets of garments, and processed 2/5 of them in 4 days, only one week before the delivery date. Can the goods be delivered on time at this rate?
15. A TV factory produced160,000 TV sets in May, more than in May 1/8. How many TV sets were produced in June?
16. The school library has purchased a batch of new books, including 240 books on science, more than those on literature 1/5. How many literature books are there?
17. The canteen plans to burn150kg of coal every day. Due to the improvement of the stove, the daily coal consumption is equivalent to 4/5 of the planned amount. How many kilograms of coal are burned every day now? How many tons of coal can be saved in a year?
18. I want to type a 2400-word manuscript, and I have finished typing 3/8. How many words are left? At the rate of 100 words per minute, how long will it take to finish writing?
2 1. After a railway is completed for 9000 kilometers, the remaining 300 kilometers is less than 3/4 of the total length. How many kilometers is this railway?
20. A 5 1 km road, the first week 1/3, the second week 1/3. How many kilometers were built in two weeks?
23. The road construction team is going to build a section of highway 1 1 day, and now it has built 640 meters, which is exactly 8/1/of the whole section. How long is this road?
24. In the first month, 60 kilometers of highway was built, which was less than that in the second month 1/4. How many kilometers were built in the second month? (Draw a line graph first, then solve the equation)
25. Build a road, with the total length of 1/5 on the first day and 1000 meters on the second day. The number of meters repaired at this time accounts for 8/ 15 of the total length. How long is this road?
26. To build a road, it's already half done. If we repair150m, we can finish half the road. What is the total length of this road?
27. A factory plans to produce 5,000 parts in the first quarter, and actually completed 2/5 in 1 month and 3/8 in February. How many parts will be produced in March to complete the task?
28. A loom can weave168m in 8/9 hours. How many meters can you weave in 2/3 hours at this speed?
Insurance companies collected 280 million yuan in insurance premiums last year, 2/5 higher than last year. How much have they collected this year?
30. Processing a batch of parts, 200 pieces were processed on the first day, 250 pieces were processed on the second day, and 3/5 of this batch of parts were processed in two days. How many pieces?
3 1. After a basket of apples was sold 1/5, 6 Jin was sold. At this time, the remaining half was sold. How many kilograms is this basket of apples?
32. A batch of apples in the canteen ate 1/4 and bought 324 apples. At this time, the number of apples is more than before 1/5. How many apples are there in this batch?
33. A car driving 1 km consumes 0. 1 liter, and the fuel tank of this car can be filled with 60 liters at most. Driving this car from Tianjin to Beijing (120 km), does he need to refuel halfway?
34. The car is going from A to B. When the car has traveled 6/ 1 1, it is still 75 kilometers away from B. How many kilometers is there between A and B?
35. Two cars, A and B, left relatively at the same time, with a distance of 420 kilometers. Five hours later, car A has traveled 3/4 of the whole journey and car B has traveled 2/3 of the whole journey. How many kilometers are the two cars apart at this time?
36. For a bundle of wires, use 1/4 of the total length for the first time, and use the remaining 1/5 for the second time. At this time, there is still 108 meter left. How long is this bundle of wires?
37. After a steel bar is cut off by 8 meters, the remaining part is 2 meters more than 3/5 of the original length. How long is this steel bar?
38. Two ropes * * * are 93m long, the first one needs 1/6, and the second one needs 5m. The remaining lengths of the two ropes are equal. How long are the two ropes?
39. There are 3400 tons of fertilizer in the warehouse. 1/4 of the total amount was taken out for the first time, and 3/ 10 of the total amount was taken out for the second time. How many tons are left?
40. There is a batch of fertilizer in the warehouse. Take out 2/5 of the total amount for the first time, and the second 12 bag is less than 1/3 of the total amount. At this time, there are 24 bags left in the warehouse. How many bags of fertilizer are taken out twice?
4 1. shipped a batch of chemical fertilizers, 2/5 of the total amount on the first day, and 60 tons more than the first day on the second day, just all of which were shipped out. How many tons are there in this batch of fertilizer?
42. A set of tables and chairs in 80 yuan, in which the price of chairs is 3/5 of that of tables. How much is this table and this chair?
43. When planting trees in the fifth and sixth grades, the number of trees in the fifth grade is 2/3 of that in the sixth grade, and the number of trees in the sixth grade is 24 less than 3/4 of the total. How many trees were planted in the fifth grade?
44. The school completed 3/8 of the plan on the first day, 5/ 12 on the second day, and planted 55 trees on the third day. The result is out of plan 1/4. How many trees does the school plan to plant?
45. The automobile factory completed 5/9 of the annual plan in the first half of last year and 3/5 of the annual plan in the second half of last year, with an over-production of 3,360 vehicles. How many cars did it plan to produce last year?
46. This garment factory plans to produce 65,438+0,500 garments in May. Two-thirds of the plan was completed in the first half of the month, and half of the plan was completed in the second half. How many pieces were actually produced?
47. Three workshops in the toy factory make a batch of toys, one workshop makes 2/7, the second workshop makes 1600, and the third workshop makes half of the sum of the first and second workshops. How many toys are there?
48. Fruit shops buy watermelons, peaches and bananas. Watermelon accounts for 2/5 of the total, peaches account for 3/4 of bananas, and bananas are 20 kilograms less than watermelons. How much are three fruits?
49. In No.20 Middle School, the number of students in grade one accounts for 1/4 of the total number, and the number of students in grade two is 3/4 of that in grade three. The number of students in grade one is 40 less than that in grade two. How many are there in three grades?
50. In Huaying Mathematics Improvement Class, boys accounted for 5/9 last semester. After adding 2 1 girl this semester, only 2/5 of them are boys. How many girls are there in the promotion class?
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.