Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 5 - Ratio and Proportion - Review Exercises: 30

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. $\frac{100}{8}=\frac{8x}{8}$ $x=12.5$
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