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 365: 25


83 people ordered vanilla. When flipping one side of the proportion the result, 750 people ordered vanilla, is unreasonable because it exceeds the total number of people.

Work Step by Step

Correct $\frac{1\ vanilla}{3\ people} = \frac{x\ vanilla}{250\ people}$ $3x = 1\times250$ $\frac{3x}{3} = \frac{250}{3}$ $x = 83$ Incorrect $\frac{1}{3} = \frac{250}{x}$ $1x = 3\times250$ $x = 750$
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