Answer
$\frac{1}{3}$
Work Step by Step
$\frac{7}{21}=\frac{/\!\!7\times1}{/\!\!7\times3}=\frac{1}{3}$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 7 - Section 7.1 - Ratio - Exercises - Page 270: 3
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