(80-64)/80=

The railway from city A to city B is 2 16 kilometers long. A train starts from a city and travels 96 kilometers in the first two hours. At this rate, how many hours will it take to get to B city? 2 16/(96/2)=

For a project, it takes 10 hour for Party A to do it alone and 15 hour for Party B to do it alone. How many hours does it take two people to complete half of the project? 1/2/( 1/ 10+ 1/ 15)=

A workshop produced *** 1280 copies of A, B and C, in which the ratio of A to B was 3: 2, and C was 80 more than A. How many copies did C produce?

( 1280-80)*3/(3+2+3)+80=

9. After the weaving factory finishes processing a batch of cloth, it takes Party A 16 days to cooperate, 20 days for Party A to do it alone, and Party B has to weave 600 meters every day. How many kilometers is this batch of cloth?

10, Party A and Party B drive in the opposite direction from the same place. Party A leaves at 6: 00 p.m. at a speed of 40,000 meters per hour. Party B left at 4 am the next day. 10 hour later, the distance between the two cars is1080km. What's the speed of car B?

1 1. Machine tool factory manufactures a machine tool, and each machine tool uses 1.5 tons of steel, which actually saves 0.25 tons. As a result, 10 more machines were produced than originally planned. How many machine tools were originally planned?

12. Xiao Wang bought a batch of toothbrushes with a wholesale price of 0.35 yuan and a retail price of 0.40 yuan. When there were 200 toothbrushes left, Xiao Wang calculated that he had made a profit after deducting all the costs. How many toothbrushes did the shop buy?

13. Salt is completely dissolved in water and becomes brine. It is known that the weight ratio of salt to water in a brine is1:10.500g salt. How many kilograms of water should I add?

14, a highway was built, and 20% of it was built five days ago. According to this calculation, how many days will it take to complete this road?

15, the original price of a washing machine 1450 yuan, is now reduced by 20%, but the price is still higher than the cost 1/9. What is the price of this washing machine?

16. The actual investment in building a new road is10.588 million yuan, which is 210.20 million yuan less than the original plan. What percentage was saved?

17. it takes 10 hour for team a to complete a project alone, and 15 hour for team b. Now Team A has to work alone for 2 hours, while everyone else in Team B is working. How many hours will it take to finish this task?

18, Xiaolin goes to school from home at 7: 30 in the morning and walks 50 meters every minute. When I first arrived at the school gate, I found that I didn't bring my math book. I immediately went back the same way and walked 70 meters per minute. It was exactly 7: 54 when I got home. How many meters is Xiaolin's home from school?

19, a cuboid warehouse, about 9 meters long, 6 meters wide and 5 meters high from the inside. If you put it in a cubic wooden box with a side length of 2 meters, how many can you put at most?

20. The accountant of a factory found that the cash was 273.6 yuan more. After checking the accounts, I found that the decimal point of an expenditure was wrong. how much is it?

2 1. A paper mill carried out household saving activities, saving 1.44 tons of coal every day. If 3 kilograms of coal can generate 7.5 degrees of electricity, how many degrees of coal can be saved every day?

22. The decimal point of a certain number is shifted to the left by one place, which is 4 1.4 less than the original number. What was the original number?

23. The area of a triangle is18cm2, its base is12cm, and how many centimeters is its height?

24. If a box of soap is distributed to a workshop worker, the average person can get 12. If it is only distributed to female workers, the average person can get 20 yuan. If it is only distributed to male employees, how much can each person get?

25. The profit of a commodity is 20% of the cost. If the profit is increased to 30%, how much should the selling price be increased?

26. There is an oil mill that squeezes oil. 100 kg rapeseed can squeeze out 38 kg oil. How many kilograms of rapeseed does it take to squeeze 1 kg oil? 1 kg rapeseed can squeeze out how many kilograms of oil?

27. Fold the 48 cm long iron wire into a right triangle with the ratio of three sides of 3: 4: 5, and find the area of this right triangle.

28. Xiaohong's family has a barrel of oil, which weighs 8 kilograms. Half of it is used, and the barrel weighs 4.5 kilograms. How many kilograms of crude oil?

29. The area of rectangular flower beds is 6 square meters. If the length is increased by 1/3 and the width is increased by 1/4, how many square meters is the area now more than before?

Let A knit X every day.

(600+x)* 16=20x

600* 16+ 16x=20x

9600=20x- 16x

9600=4x

x=9600/4

x=2400

10,40000 * (28-18) =400000 (m) = 400 (km) 1080-400=680 (km) 680/10 =

A: B travels 28 kilometers per hour.

1 1. Set the original planned machine tool as X sets.

X * 1.5 =( 1.5-0.25)*(X+ 10)

Then X=50.

12,200/(0.4-0.35) = 4000 (branches) 4000+200=4200 (branches)

13500/0. 1 = 5000 (g)

14,5/20% = 25 (days)

15,1450 * (1-20%) =1160 (yuan)1160/(1)

16.158.8-21.2 =137.6 (ten thousand yuan)

137.6÷ 158.8≈86.6%

A: It saved 86.6% than planned.

17,2/10 =1/515 * (1-1/5) =12 (hours)

18 His average speed twice was 60 *** and he walked for 24 minutes on average 12 minutes.

So the home is 60* 12=720 meters away from school.

19, integer withdrawal, tail cutting method. 9/2=4,6/2=3,5/2=2.4*3*2=24.

20, 10X is 273.6 more than x.

That is 10X-X=273.6.

9X=273.6

X=30.4

2 1, 1.44 tons = 1440kg 7.5/3=2.5 degrees 1440*2.5=2650 degrees.

22、4 1.4/ (9/ 10)=46

23. 18*2=36 (cm)

36÷ 12=3 (cm)

Answer: The height is 3 cm.

24,1÷ (112-1/20) = 30 pieces.

25. If the cost is 1, the original selling price is (1+20%)= 1.2. If the profit is increased to 30%, the selling price is (1+30%) = 1.3-65438.

28: 8-4.5 = 3.5 (kg) Oil: 3.5 times 2=7 (kg)

26: 38 divided by 100=0.38 (kg) 100 divided by 38= 100/38=50/ 19 (kg).

27, 48*5/3+4+5=20 (cm) 48*4/ 12= 16 (cm) 48*3/ 12= 12 (cm)

12* 16/2=96 (square centimeter)

28, (8-4.5)x2=7 (kg)

29. If the original length x width y xy=6, the current area is (1+1/3) x * (1+1/4) y = 5/3xy =10.