65 two step or two step questions must have answers, or not scores

1) A took a total of 15 days, A took 5 days off, and actually worked for 15-5=10 days.

B did it for 15 days.

Compared with the cooperation of A and B to be completed in 12 days, A has worked less than 12-10 = 2 days.

B did more than 15-12 = 3 days.

That is, the work completed by A in 2 days is equal to the work that B regrets in 3 days.

B is 2 3 of A

The ergonomics of A is (1 12) (1 + 2 3) = 1 20 A needs 1 (1 20) = 20 days to complete alone.

2) A can complete 1 10 per day

B can complete 1 30 per day

A rests for 2 days and B rests for 8 days, which can be seen as A and B resting together for 2 days, and B resting alone for 8-2 = 6 days.

That is, A has worked alone for 6 days, and can complete 1 10 * 6 = 3 5 5 and 1-3 5 = 2 5, A and B work together, and it takes (2 Xuhu 5) (1 10 + 1 30) = 3 days.

So from the beginning to the finish, I used it a long time ago:

2+6+3=11 days.

1.Solution: Let the total amount of work be 1, the work efficiency of A is X, and the work efficiency of B is Y

x+y)x12=1

10x+15y=1

From the above two equations, x=1 20 is obtained, so A's work efficiency is 1 20, that is, A needs 20 days to work alone.

1. A project, a team A and B work together, and it can be completed in 10 days. If Team A does 4 days and Team B does 6 days, a total of 7 15 of the project will be completed. How many days does it take for Team A to do this project alone?

2. A batch of books is divided among three students: A, B, and C, A gets 1 5 and 5 of the total number of books, B gets 1 4 and 7 of the total number of books, C gets 1 2 of the rest of the books, and the remaining books are exactly 1 8 of the total number of books. How many books are there in this batch?

3. Build a road, the number of meters that have been repaired is 3 2 of the number of unrepaired meters, if you repair another 30 meters, the ratio of the number of repaired meters to the number of unrepaired meters is 7 3, how many meters is this road?

1.The speed of A is a, the speed of B is b, and the total project is 1The equation can be derived:

7/15*10（a+b)=4a+6b

gives b=a 2

Substituting b=a2 into 10(a+b)=1 gives a=1 15, so it takes 15 days for team A to do it alone.

2.Suppose there are x books in total, and the equation can be derived:

x/5+5+x/4+7+2x/8=x

Solution x=40

So there are 40 books in total.

3.Let the number of repaired meters be a and the unrepaired number be b, and the system of equations can be obtained

a=3/2b

3/2b+30)/(b-30)=7/3

Solution: a=180, b=120, the total length of the road is a+b=300 meters.

1.The fertilizer plant plans to produce 7,200 tons of fertilizer, which has been in production for 4 months, with an average of 1,200 tons of fertilizer per month, and the remaining 800 tons per month, how many months will it take to complete?

2.The plastic plant planned to produce 1,300 pieces of plastic molds, and 780 pieces were produced in 6 days. At this rate, how many days will it take to produce the rest of the production?

3 Master Li produced 252 parts in 4 hours in the morning and another 3 hours in the afternoon at this rate. How many parts did Master Li produce in one day?

4.The cement plant plans to produce 3,600 tons of cement, which will be completed in 20 days. The actual daily production is 20 tons more than planned, how many days will the task be completed?

5 A pile of coal can be burned for 10 days, and after improving the stove, it will save tons per day compared with the original plan, how many days can this pile of coal be burned now?

6.A and B are 420 kilometers apart, and a passenger car is scheduled to travel for 7 hours from A to B. The actual hour is 10 kilometers more than planned, how many hours does it actually take?

7 Xiaoqiang goes back to school from home, if he walks 50 meters every minute, he will return to school in 12 minutes, and if he walks 10 meters more every minute, he can go back to school a few minutes earlier?

8.To build a kilometer-long road, build an average of kilometers per month for the first 3 months, and repair the remaining kilometers every month, and how many months will it take to complete?

9 Xiao Ming used yuan to buy stationery, bought 6 pencils, each yuan, and the rest of the money to buy ballpoint pens, each yuan, how many can you buy?

10.The garment factory originally planned to make 120 suits, each suit with bumi, after improving the cutting method. Each set of cloth is saved, and how many sets of clothes can be made into suits now?

Happy Farm harvested 6,000 tons of cabbage last year, and this year's output increased by 2 into 5 compared with last year

2] The school bought 55 soccer balls, 20% less than soccer balls, how many basketballs were bought

3] The engineering team built a 3,000-meter-long road, how many meters are left after repairing?

The store shipped 120 boxes of pens, 40% more ballpoint pens than pens, how many boxes of pens and ballpoint pens were shipped?

The original price of a bag of rice is 50 yuan, and after two consecutive price reductions of 10%, how much should the price be?

225 300 = 27000000 cubic millimeters = 27 liters of Kai crack.

25 cubic meters of tansun hands.

8 10000 1500 pcs.

Good luck with you.

Solution: (1) and (2) are the same distance as the circumference of a square plus a large circle circumference, 4 4 ten 4

3) The distance is four small circles plus the circumference of the square 4 4 ten 4 丌 2