Question

There are 12 books on a shelf 5 of these books are new the rest are used what is the ratio of new books to used books

Answer 1

5:7

Explanation:

Basically you first find the amount of the books are the shelf knowing that you have 5 new books, you subtract the amount of new books from total books. And 5:7 can't be simplified any further making 5:7 the answer.