Answer
Because we want a unit rate
Work Step by Step
A unit rate tells us how much of the first quantity will occur in 1 of the second quantity
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 6 - Section 6.1 - Ratios and Rates - Vocabulary, Readiness & Video Check - Page 416: 10
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