Answer
A child weighing 80 pounds has 72 pounds of water.
Work Step by Step
$\frac{90\ lb\ water}{100\ lb\ body} = \frac{x\ lb\ water}{80\ lb\ body}$
$100x = 90\times80$
$\frac{100x}{100} = \frac{7200}{100}$
$x = 72$
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 365: 28
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