Answer
$x=6.75$ hours
Work Step by Step
Set up a proportion.
$\frac{4 songs}{3 hours} = \frac{9songs}{xhours}$
Cross multiply.
$3(9)=4x$
Solve.
$x=6.75$ hours
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 2 - Solving Equations - 2-7 Solving Proportions - Lesson Check - Page 127: 5
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