Elementary Algebra

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

Chapter 4 - Proportions, Percents, and Solving Inequalities - 4.3 - More on Percents and Problem Solving - Problem Set 4.3 - Page 162: 58

Answer

x = 320

Work Step by Step

0.10x + 0.12(720 - x) = 80 Multiply both sides by 100 to free the equation of all decimals, and then use the distributive property. 10x + 12(720 - x) = 8000 10x + 8640 - 12x = 8000 In order to solve for x, we first need to get all of the terms with an x in them on the same side of the equation. 10x - 12x = 8000 - 8640 -2x = -640 Divide both sides by -2. x = 320
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