Elementary Algebra

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

Chapter 4 - Proportions, Percents, and Solving Inequalities - Chapter 4 Review Problem Set - Page 184: 46

Answer

x = 15

Work Step by Step

0.40x + 0.24(20-x) = 0.36(20) Multiply both sides by 100 to clear the equation of all decimals. 40x + 24(20-x) = 36(20) Use the distributive property. 40x + 480 - 24x = 720 40x - 24x = 720 - 480 16x = 240 Divide both sides by 16. x = 15
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