Introductory Algebra for College Students (7th Edition)

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

Chapter 2 - Section 2.7 - Solving Linear Inequalities - Exercise Set - Page 197: 129


$8$ is $40$% of $20$.

Work Step by Step

We start by translating the statement. "$8$ is" means "$8$ =" "$40$% of what number" means "$40$%($x$)" We put both parts of the statement together to get: $8$ = $40$%($x$) We want to change the $40$% into a decimal to be able to work with it more easily. We do this by taking the % sign off and moving the decimal point two places to the left: $$8 = 0.40x$$ Divide both sides by $0.40$ to isolate $x$: $$x = 20$$
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