A few math problems, tell me the process, write them down and explain the reasons. It's all equation problems, and who to write is unknown!

1) solution: let each child have x yuan.

Then: 2×4+2X= 1 1

Solution: X= 1.5

A: Each child ticket 1.5 yuan.

2) Solution: Let each unit price be X yuan.

Then: 6X+9X= 1.5

Solution: X=0. 1

A: The unit price is 0. 1 yuan.

3) Solution: Suppose my age is X this year.

So: 3X=X+24

Solution: X= 12

So: X+24=36

A: I am 12 years old and my mother is 36 years old.

4) Solution: Let each set of books have X volumes.

Then: 2.5X+3X=22.

Solution: X=4

There are 4 books in each series.

5) Solution: Assuming that the goods are shipped x times in the afternoon, the goods can be shipped.

Then: 3×5+5X=35.

Solution: X=4

A: Four times in the afternoon.

6) Solution: Let Xiaohong walk x meters per minute on average.

Then: 7×45+7X=560.

Solution: X=35

Xiaohong walks 35 meters per minute on average.

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