Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 6 - Section 6.3 - Proportions and Problem Solving - Exercise Set - Page 434: 1


It will take her 165 minutes

Work Step by Step

First, we translate the question into an equation: $\frac{30}{4} = \frac{x}{22}$ Now, we solve for $x$ by cross multiplying, which states that if $\frac{a}{b} = \frac{c}{d}$, then $ad = bc$. This result can be achieved by multiplying both sides by $cd$. $4x = 660 \rightarrow x = 165$
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