Answer
$\frac{15}{4}=3\frac{3}{4}$
Work Step by Step
$\frac{21a}{4}\div\frac{7a}{5}=\frac{21a}{4}\times\frac{5}{7a}
=\frac{3\times/\!\!7\times /\!\!a}{4}\times\frac{5}{/\!\!7\times /\!\!a}
=\frac{3\times5}{4}=\frac{15}{4}=3\frac{3}{4}$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 4 - Review - Page 319: 38
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