Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 5 - Ratio and Proportion - 5.5 Solving Application Problems with Proportions - 5.5 Exercises - Page 364: 14


2.2 gallons are needed to apply 3 coats.

Work Step by Step

$\frac{1\ gal}{550\ sq\ ft} = \frac{x}{3(400\ sq\ ft)}$ $550x = (1)(3)(400)$ $\frac{550x}{550} = \frac{1200}{550}$ $x = 2.2 gal$
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