Elementary Algebra

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

Chapter 4 - Proportions, Percents, and Solving Inequalities - Chapters 1-4 Cumulative Review Problem Set - Page 186: 34

Answer

x = 200

Work Step by Step

0.09x + 0.12(500-x) = 54 Multiply both sides by 100 to clear the equation of all decimals. 9x + 12(500-x) = 5400 Use the distributive property. 9x + 6000 - 12x = 5400 6000 - 5400 = 12x - 9x 600 = 3x Divide both sides by 3. x = 200
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