Winter vacation homework problem in fifth grade mathematics. This requires a process. Thank you for your cooperation. (As long as the answer to the sixth question)

1.200/3*5=333.33 meters, less than 360, not up to it.

2.80/( 1/5- 1/7)= 1400g

3. Did you copy the wrong number of questions?

4. The first purchase price is 1200 * 5/6 = 1000 yuan.

The purchase price of the second paragraph is 1200 * 5/4 = 1500 yuan.

1200+ 1200< 1000+ 1500

So in general, it is a loss. It is suggested to increase the number of the first paragraph.

5.( 1) Set the water consumption as x.

Spend 2.8 million yuan

(2) Let the water consumption after 10 ton be x.

Consumption 28+2.8* 1.5X

(3) Consumption exceeds that of 28 yuan, and water consumption exceeds 10 ton. Use the calculation method of the second question:

28+2.8* 1.5X=48

X is about 5, so the water consumption is 15 tons.

6.6.3/5 = 63/50 (find C) = 1.26 = 126% (find D).

A= 15/ 1.26

B= 12/ 1.26