Answer
22.5 hours
Work Step by Step
$\frac{4 strips}{5 hours}$=$\frac{18 strips}{x hours}$
4x=18(5)
4x=90
x=22.5 hours
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 5 - Ratio and Proportion - 5.5 Solving Application Problems with Proportions - 5.5 Exercises - Page 363: 3
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