Question

There are 7 new books and 5 used books on a shelf.

(a) What is the ratio of new books to all books on the shelf?
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(b) What is the ratio of used books to all books on the shelf?
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Answer 1

a) 7:13 b) 5:13

Explanation:

There are 7 new books (-> 7:--) theres 5 used books, add the 7 new books and 5 used books together. it said "The ratio for new books to all books?" it must be in that order. with leads you to 7:13

do the same thing for b) using the same steps.

Answer 2

7 * 5 =35 because if you say 5 10 15 20 25 30 35 then that's your answer