Answer
140
Work Step by Step
Use cross multiplication.
$\frac{2.5}{100}=\frac{3.5}{x}$
$2.5x=3.5\times100$
$2.5x\div2.5=350\div2.5$
$x=140$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 7 - Section 7.3 - Solving Percent Problems with Proportions - Exercise Set - Page 492: 43
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