There are story books and cartoon picture books in the school library. There are 72 story books more than cartoon picture books, which is three times that of cartoon picture books. How many story book

There are story books and cartoon picture books in the school library. There are 72 story books more than cartoon picture books, which is three times that of cartoon picture books. How many story books are there? This is a typical problem about the difference of Olympic Mathematics in primary schools.

Solution: comic album 72 \u( 3- 1)= 36 (this)

Storybook 36+72= 108 (Ben)

Thinking: Difference ÷ (multiple-1)= decimal.

Decimal+difference = large number