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Ask the top primary school students the math questions in the six-year question bank
First determine the unit "1".

Because this topic has two different individuals, it is most appropriate to take the same book as "1" last time. Then the book 1 * * * is "2" units.

So before b publishes the book:

B Books with1÷ (1-1/4) =1÷ 3/4 = 4/3 units.

A has 2-4/3=6/3-4/3=2/3 units of books.

So before A gives B a book:

A book with 2/3 ÷ (1-1/5) = 2/3 ÷ 4/5 = 2/3× 5/4 = 5/6 units.

So B has 2-5/6=7/6 units of books.

So:

The book ratio of A and B is 5/6: 7/6 =5:7.