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: 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
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.