Question

A used bookstore will trade 2 of its books for 3 of yours. If Val brings in 18 books to trade, How many books can she get from the store?

Answer 1

12 from the bookstore

Explanation:

3 of yours ↔ 2 from the bookstore

18 of yours ↔ 12 from the bookstore

Answer 2

She will get 12 books from the store

Explanation:

We can use ratio's to solve

2 books out x books out

------------------- =-----------------------------

3 books in 18 books in from Val

Using cross products

2 * 18 = 3 *x

Divide each side by 3

2*18 /3 = 3x/3

2*6 = x

12 =x

She will get 12 books from the store