Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 9 - Basic Algebra - 9.8 Using Equations to Solve Application Problems - 9.8 Exercises: 34

Answer

The number is $9$.

Work Step by Step

Let $x=$ the number $\frac{1}{3}x + 3x = 30$ $\frac{x}{3} + 3x = 30$ $x + (3x \times 3) = (30 \times 3)$ $x + 9x = 90$ $10x = 90$ $x = \frac{90}{10}$ $x = 9$
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