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A and B have 30 books. A has four times fewer books than B. How many books do A and B have respectively?
Analyze according to the following line segment diagram:

If the number of books of Party B is regarded as "1", and the number of books of Party A is 4 times 5 less than that of Party B, then the number of books of Party A and Party B plus 5 equals "5".

(30+5)÷( 1+4)=7 (Ben)

Explain that the number of books represented by the unit "1" is 7, that is, B has 7 books.

7×4-5=23 (Ben)

Explain that A has 23 books.

Checking calculation: 23+7=30 (Ben)

A has 23 books and B has 7 books.

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