Answer
$\frac{3}{4}$.
Work Step by Step
$\frac{21}{28} = \frac{3 \cdot 7}{4 \cdot 7} = \frac{3}{4}$.
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 3 - Adding and Subtracting Fractions - 3.2 Least Common Multiples - 3.2 Exercises - Page 212: 33
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