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There are story books and science books in the library. There are 720 story books, three times as many as science books. How many story books and science books are there?
Set up x science books and 3X story books.

X plus 3X equals 720.

4X equals 720.

X equals 720 divided by 4.

X is equal to 180.

There are 180 science books and 540 story books.

If you use formulas to solve problems:

Divide the whole book into four parts, a science book and three story books, a total of four.

Storybook: 720 times (1- 1/4) equals 540 books.

Science books: 720 times (1-3/4) equals 180 books.

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