Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 4 - Proportions, Percents, and Solving Inequalities - 4.1 - Ratios and Proportions - Problem Set 4.1 - Page 149: 63


90000 people are expected to vote.

Work Step by Step

Let X represent the number of people expected to vote. Three out of every seven eligible voters are going to vote, so the ratio is $\frac{3}{7}$. Now, let’s set up a proportion with the ratio given and a ratio which compares the corresponding number of people. So, $\frac{3}{7}$ = $\frac{X}{210000}$ To solve this equation, we equate the cross products. 3 $\times$ 210000 = 7 $\times$ X 630000 = 7X X = 90000
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