Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 4 - Cumulative Review - Page 209: 3



Work Step by Step

To find the number we set up a ratio by rewriting $31.4\%$ as a fraction. We then cross-multiply and solve for $x$: $$\frac{18.84}{x}= \frac{31.4}{100} \Longrightarrow 18.84= \frac{31.4}{100} \cdot x\Longrightarrow x=\frac{100\cdot 18.84}{31.4}=60 .$$
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