Answer
2.2 gallons are needed to apply 3 coats.
Work Step by Step
$\frac{1\ gal}{550\ sq\ ft} = \frac{x}{3(400\ sq\ ft)}$
$550x = (1)(3)(400)$
$\frac{550x}{550} = \frac{1200}{550}$
$x = 2.2 gal$
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 5 - Ratio and Proportion - 5.5 Solving Application Problems with Proportions - 5.5 Exercises - Page 364: 14
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