Answer
$x=12.5$
Work Step by Step
We can set the cross products of the given proportion equal to each other and then solve for the unknown variable.
$5\times20=8\times x$
$100=8x$
Divide both sides by 8.
$\frac{100}{8}=\frac{8x}{8}$
$x=12.5$
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 - Review Exercises - Page 373: 30
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