2. Three quarters of the campus area is open space, and 1/3 of the open space should be paved with lawns. What is the proportion of lawn in the total campus area?
3. Students in Class One and Class Two are cleaning the school playground. Each class is responsible for cleaning half of the playground. Class One has completed 3/5 of the task and Class Two has completed 4/7 of the task. How many fractions have the two classes cleaned the playground respectively?
There are 35 students in Class Three, Grade Five, seven quarters of whom are boys. How many boys are there? The number of boys with myopia accounts for110. How many boys are nearsighted?
5. On Xiaojun's birthday, mom bought a cake and cut it for Xiaojun 1/4. Xiaojun only ate 1/3. How much did Xiaojun eat from the whole cake?
6. I bought a barrel of oil in the canteen and used about 1/7 this barrel of oil every day. How much oil did I use in four days? How many points are left?
7. Xiaohua saved 40 yuan pocket money, and he donated 2/5 of it to Hope Primary School in the earthquake-stricken area. How much money is left in Xiaohua?
8. There are 800 students in bright primary school, and the fifth grade students account for 3/8 of the total number of students in the school. How many students are there in Grade Five? The number of girls in the fifth grade is two-fifths of the students in this grade. How many girls are there in the fifth grade?
9. The content of protein in soybean is about 9/25. If there are 4/5 tons of soybeans, how many kilograms of protein can be extracted from them?
10, Gui Lan renovated a new telephone and bought a 30-meter-long telephone line, but only 2/5 of it was actually used. How many meters are left?
1 1, rectangular beverage box, its length, width and height are 6 cm, 3.2 cm and 9.5 cm respectively. If a circle of trademark paper is attached around (not up and down), what is the area of this trademark paper at least?
12, a washing machine, 90 cm high, 50 cm long and 45 cm wide at the bottom. How much cloth does it take to make a cloth cover for a washing machine?
13. A glass fish tank without a cover is a cube 5 centimeters long. What is the minimum glass area needed to make this fish tank?
14. Xiaolan's room is 5.5 meters long, 2 meters wide and 3 meters high. In addition to 6.5 square meters of doors and windows, the walls and roofs of the room are covered with wallpaper. How much wallpaper does this room need at least?
15. Draw the surface of a toolbox with a length of 40cm, a width of 30cm and a height of 20cm. What is the area to be drawn? (No coating on the bottom)
16. A laboratory is10m long, 7m wide and 4m high. Paint the ceiling and four walls of the laboratory, excluding doors, windows and blackboards, covering an area of 25 square meters, with an average of 0.2 kg of lime per square meter. How many kilograms of lime does a * * * need?
17. There are six people playing basketball on the playground, and the number of people playing basketball is 6/ 14 of the number of people playing football. How many people play football? The number of people kicking shuttlecock is 1/7 of that of football players. How many people kick shuttlecock?
18. There are 8 weekends in a month, which is 4/ 15 of the total days in this month. How many days are there in this month?
19, Xiaoming's height 140 cm, Xiaoming's height is 14/ 15. How tall is his mother? Mom's height is 3/4 that of dad. How many centimeters is dad's height?
20. The incubation period of ducks is 24 days, and chickens are 3/4 of that of ducks and ducks are 6/7 of that of geese. What are the incubation periods of chickens and geese?
2 1. The school building covers an area of 50 square meters, accounting for about 5/8 of the total campus area. What is the total area of the campus?
22. Yucai Primary School 10 uses 2 10 tons of water in October, which is exactly 7/8 of the water consumption in September. How many tons of water were used in September?
23. From Beijing Railway Station to Guangzhou, the train traveled 5/ 1 1 after 5 o'clock. How long does it take from Beijing to Guangzhou?
24. There are ***20 plant specimens, the number of which is 4/5 of that of animal specimens. How many animal specimens are there?
25. The price of a dress after 65% discount is 72 yuan. What is the original price of this dress?
26. Xiaohong's family used 1/6 bottles of cooking oil for three days. How much is this bottle of oil used on average every day? How many days can this bottle of oil last?
A reservoir is 6 meters long, 4 meters wide and 3 meters deep. How many square meters does it cover? How many liters of water can you hold at most? If the surrounding and bottom are plastered with cement, how many square meters is the plastering area? The table top of the table tennis table is a rectangular plate, which is 274 cm long, 2.5 cm wide and 2.5 cm thick. 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 with specifications of 40cm×40cm are needed now? How much is a square meter of tile in 85 yuan? A warehouse painted the walls. The warehouse is 50 meters long, 40 meters wide and 5 meters high, with doors and windows covering an area of 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, width 1.4 m. The door is 2 meters high and 0.8 meters wide. Tile and tile around. How many square meters of tiles and tiles do you need to buy? Painting a wall of 80 square meters needs to be done 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 lost about 5 liters of pigment when actually painting. * * How many liters are needed?
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? A rectangular water tank without a cover is 2m long, 8m wide and 6m high. How many square decimetres does it take to make this water tank? How many liters of water can I hold at most?
Every 50,000 pairs of disposable chopsticks need 1 tree, and each tree can absorb110 kg of carbon dioxide every day. A hotel receives about 654.38 million 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? Shelf A has 600 books. After lending13 from shelf A and 3/4 from shelf B, there are twice as many books in shelf A as there are in shelf B, and there are 150 books in shelf B. How many books are there in shelf B?
Human blood accounts for about113 of human body weight, of which about two thirds is water, and the warm and warm body weight is 39 kg. How many kilograms of water does her blood contain? A company wants to repair a batch of computers, and has already repaired 1/3, and repaired 24 computers, which is exactly half of the computers. How many computers are there?
There are 420 peach trees in the orchard, 2/5 more than apple trees. How many peach trees are there than apple trees? The garment factory processed 1200 sets of garments, and processed 2/5 sets in 4 days, only one week before the delivery date. At this rate, can the goods be delivered on time?
A TV factory produced 6.5438+0.6 million TV sets in May, 654.38+0/8 more than in May. How many TV sets were produced in June? The school library has newly purchased a batch of books, including 240 scientific books, more than literature books 1/5. How many literature books are there?
The canteen plans to burn 150kg 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? 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?
A railway, after 9000 kilometers, the rest is 300 kilometers, less than 3/4 of the total length. How many kilometers is this railway? A 5 1 km road, the first week 1/3, the second week 1/3. How many kilometers were built in two weeks?
The road repair team is going to repair a section of highway 1 1 day, and now it has repaired 640 meters, which is exactly 8/1/of the whole section. How long is this road? A section of highway, 60km was built in the first month, 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)
A road was built, with the total length of 1/5 on the first day and 1000m on the second day. The number of meters repaired at this time accounts for 8/ 15m of the total length. How long is this road? You've built a road, and it's already halfway done. If we repair150m, we can finish half the road. How long is this road?
A factory plans to produce 5000 parts in the first quarter, with 2/5 actually completed in 1 month and 3/8 completed in February. How many parts will be produced in March to complete the task? A loom can weave168m in 8/9 hours. How many meters can you weave in 2/3 hours at this speed?
Insurance companies collected insurance premiums of 280 million yuan last year, 2/5 higher than last year. How much have they collected this year? Processing a batch of parts, 200 pieces on the first day, 250 pieces on the second day, and processing 3/5 of this batch of parts in two days. How many parts are * * *?
After a basket of apples was sold 1/5, it sold 6 kilograms. At this point, it just sold half of the remaining apples. How many kilograms is this basket of apples? 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?
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? 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?
At the same time, cars A and B, which are 420km apart, leave relatively. 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? 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?
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? 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 these two ropes?
There are 3,400 tons of chemical fertilizers in the warehouse, of which 1/4 was taken out for the first time and 3/ 10 for the second time. How many tons are left? 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?
A batch of chemical fertilizers was shipped, which accounted for 2/5 of the total amount on the first day, and 60 tons more than the first day on the second day, which just happened to be all shipped out. How many tons are there in this batch of fertilizer? A set of tables and chairs, 80 yuan, in which the price of chairs is 3/5 of that of tables. How much is this table and this chair?
Trees were planted in grade five and grade six. The number of trees planted in the fifth grade is 2/3 of that in the sixth grade, and 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? 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?
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 overproduction of 3,360 vehicles. How many cars did it plan to produce last year? In May, the garment factory plans to produce 65,438+0,500 garments. 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?
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? The fruit shop buys 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?
The number of students in Grade One in No.20 Middle School 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 grade three? In Huaying math promotion class, boys accounted for 5/9 last semester, but after adding 265,438+0 girls this semester, boys only accounted for 2/5. How many girls are there in the further education class?
Wenwen read a story book. On the first day, he read 2/7 of the book. On the second day, he read the remaining 3/5, six pages more than on the first day. How many pages are there in this book? Jia Jia read a book. On the first day, she read 1/4, and the next day, she read 18 pages. At this point, the number of pages she has read is the remaining 3/5. How many pages did Jaga read on the first day?
A book, Lele read 1/8 on the first day, 10 page was missing on the second day, and 1/4 was left on the third day. Which page should he read on the fourth day? A coat 280 yuan, 60% off the original price. How much cheaper than the original price?
There are 120 people in factory A and 80 people in factory B. How many people can factory B transfer to factory A, so that the number of people in factory A is 5/3 of that in factory B?
Last year, Wang Tong primary school planted 240 trees, and 15 trees died. The Seed Research Institute used 500 seeds for germination test, and 465 seeds germinated. What is the germination rate of these seeds?
In the food sampling inspection, brand A randomly selected 50 boxes, and 7 boxes were unqualified; Brand B randomly selected 60 boxes, and 8 boxes were unqualified. Which brand of food has a high pass rate?