Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 3 - Cumulative Review Exercises - Page 279: 7


The number we are looking for is $800$.

Work Step by Step

We first translate this statement into an algebraic equation: "$120$ is" means "$120 = $." "15% " can be translated into a decimal, which would be $0.15$. "Of what number" means multiplying by $x$. We now put the whole statement together into the following equation: $$120 = 0.15x$$ We solve for $x$ by dividing each side by $0.15$: $$x = 800$$ The number we are looking for is $800$.
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