250+320=570
570- 180=390
2. Repair a section of road. The full length 1/4 was repaired on the first day, and 90 meters was repaired on the second day. At this time, there is still150m to be repaired. How long is this road?
3.4250 kg of flour can be ground with 5000 kg of wheat to get the flour yield of wheat.
Wheat flour yield is 80%. How many kilograms of wheat does it take to grind 640 kilograms of flour?
Wang Fang's deposit is 2.2 times that of Li Li. If Li Li and 75 yuan are deposited in the bank again, their deposits will be equal. How much did each of them save?
6. The master and the apprentice * * * processed 208 machine parts, and the number of parts processed by the master was four times that of the apprentice. How many parts did the master and apprentice process respectively?
7. The staff canteen planned to burn 5 tons of coal in April, but actually burned 4.8 tons. What percentage was saved?
8. In the fifth grade, buy a batch of notebooks for miyoshi students. If each student is awarded 5 copies, there are 3 copies left; If each person sends 6 copies, it will be less 12 copies. How many "three good" students did you choose in the fifth grade? How many notebooks did you buy?
9. A trapezoidal wheat field with an area of 540m2, a height of18m, an upper bottom of 20m and a lower bottom of several metres?
10, two cars leave from the same place at the same time. After driving for 4.5 hours, car A lags behind car B at 13.5 km. It is known that car A travels 35 kilometers per hour. How many kilometers does bus B travel per hour?
1 1, a * * There are 150 people going for a spring outing, and 54 people have already left. The rest need two cars. How many people can each car carry on average?
12. A horse eats 12 kg of grass every day. According to this calculation, how many kilograms of grass can 25 horses eat a week?
13. There are 6 people in the first group, and the average score of 5 people in the Chinese exam is 85. After adding Wang Gang's score, the average score is 87. What's Wang Gang's exam score?
14. The rectangular playground is 50m long and 40m wide. After the expansion, the length and width increased by 5 meters respectively. How many square meters has the playground area increased after the expansion?
15. Two water pipes simultaneously discharge water into the pool. The discharge of the thick pipe is15t per hour, and that of the thin pipe is 1 1 ton per hour. How many tons of water can this pool hold in eight hours?
16, one ton of waste paper can produce 700 kilograms of paper. If one kilogram of paper can make 25 exercise books, how many exercise books can be made from 12 tons of waste paper?
17. Students participate in environmental protection actions. The fifth grade cleared 3/5 tons of garbage, less than the sixth grade 1/8 tons. How many tons of garbage were removed in the fifth and sixth grades?
18. A rectangular glass jar, measured from the inside, is 5 decimeters long and 3 decimeters wide. Existing water depth 1.5 decimeter. When a stone is immersed in water, the water depth is 2 decimeters. What is the volume of this stone?
19 a 9.6-square-meter board, cut and nailed into a 2-meter-long cubic wooden box. How many nails can you nail at most?
20. A plot of land, in which 1/5 kinds of corn, 1/6 kinds of vegetables and the rest kinds of watermelons. What is the proportion of watermelons planted in this land?
2 1. Uncovered rectangular iron drum with a square bottom, a side length of 4m and a height of1m.. How much iron does it take to make such a barrel? How many liters of water can this barrel hold?
22 The canteen delivered 7,000 kilograms of rice, 2.5 times less than the flour delivered, and 500 kilograms less. How many kilograms of flour were delivered?
A professional household keeps 3500 chickens and ducks. It is known that the number of ducks is 2.5 times that of chickens. How many chickens and ducks are there?
24 Two cars, A and B, walk back from AB, 20 kilometers apart. Party A travels 80 kilometers per hour, which is twice the speed of Party B. How many kilometers are the two cars apart after five hours?
25. A cuboid container with a bottom area of 16 square decimeter and a water height of 6 decimeters is now put in an iron block with a volume of 24 cubic decimeters. How high is the water surface at this time?
26. Xiaoming's mid-term exam, the average number of words is 97, plus the average score of 97.5 in the three subjects of science. How many points did Xiao Ming get in the natural exam?
27, a workshop to process 9000 parts, known processing for 5 days, an average of 800 pieces a day, the rest of the requirements for 4 days to complete, the average number of pieces a day?
28, a batch of goods, each batch of 5.5 tons, 10 times can be shipped out, if you want to ship out eight times, how many tons on average each time?
There was a batch of stock in the warehouse, which will be transported into the warehouse one after another, and the same amount of goods will be brought in every day. Now all the goods in the warehouse are transported by cars with the same load. If you use four cars every day, it will be shipped in nine days, and if you use five cars, it will be shipped in six days. How many days does it take to transport the original goods out of the warehouse by one car every day?
10
The first method:
A Distance traveled: 35x4.5= 157.5.
Driving distance:157.5+13.5 =171.
Speed of b = distance of b/time of b.
17 1/4.5=38 (km/h)
The second method:
Suppose b travels x kilometers per hour.
35x4.5-4.5x= 13.5
Solution: x=38
1 1 150-54=96
96/2=48
12 12x 25 x7 = 2 100
13 85x5=425
87x6=522
522-425=97
14 50x40 = 2000m2
50+5=55 (meter)
40+5=45 (meter)
55x45=2475 square meters
2475-2000=475 square meters
Misunderstanding:
5x5=25 (square meter)
158 x (15+11) = 200 (ton)
1612x700x25 = 210000 (kg)
17
3/5+ 1/8=0.725
18
2- 1.5=0.5
0.5/(5x3)= 1/30
19 attention unit
9.6 square meters =960 square decimeters
2x2=4 (square meter) surface area.
960/4=240 (pieces)
240/6=40 (pieces)
20
1- 1/5- 1/6= 19/30
2 1 1 m = 10 decimeter
4x4+4x 10x4= 176 (square decimeter)
4x4x 10= 160 (cubic decimeter)
160 cubic decimeter = 160 liter
This barrel can hold 160 liters of water.
22 solution: set of rice noodles x kg.
2.5x-500=7000
x=480
7000+500= 1200
1200/2.5=480
Solution: Suppose there are X chickens, then the duck is 2.5x
x+2.5x=3500
x= 1000
24 The speed is 80/2=40.
20+(80+40)x5=620
25 24/ 16= 1.5
6+ 1.5=7.5
26 97x2= 194
97.5x3=292.5
292.5- 194=98.5
27 5x800=4000
9000-4000=5000
5000/4= 1250
28 5.5x 10=55
55/8=6.875