Elementary Algebra

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

Chapter 3 - Equations and Problem Solving - 3.2 - Equations and Problem Solving - Problem Set 3.2 - Page 107: 67


The amount of rainfall in July was 6.1 inches.

Work Step by Step

Let X represent the amount of rainfall in inches in July. The rainfall in June was 11.2 inches. This was 1 inch less than twice the rainfall in July. Twice the rainfall in July means 2X. 1 inch less than twice the rainfall in July means 2X - 1. Thus, we obtain: 11.2 = 2X - 1 Add 1 to both sides: 12.2 = 2X Divide both sides by 2 6.1 = X
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