Question

Sold 72 books. if ratio of books to bookmarks is 9:2, how many bookmark was sold?

Answer 1

40

Explanation:

They sold 9 book marks for every 2 books (9:2 ratio).

72/9 = 2/x

Cross multiply. 72 * x = 72x

9 * 2 = 18

72 divided by 18 = 40

Answer 2

16 bookmarks were sold