Answer
9:5
Work Step by Step
$\frac{720}{400}=\frac{/\!\!\!80\times9}{/\!\!\!80\times5}=\frac{9}{5}$
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: 38
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