Answer
The number is $9$.
Work Step by Step
Let $x=$ the number
$\frac{1}{3}x + 3x = 30$
$\frac{x}{3} + 3x = 30$
$x + (3x \times 3) = (30 \times 3)$
$x + 9x = 90$
$10x = 90$
$x = \frac{90}{10}$
$x = 9$
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 9 - Basic Algebra - 9.8 Using Equations to Solve Application Problems - 9.8 Exercises - Page 687: 34
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