Answer
$5$ hits.
Work Step by Step
Step 1. Assume you need $x$ number of additional hits; we have $\frac{30+x}{120+x}=0.28$
Step 2. Solve the above equation to get $30+x=33.6+0.28x$, $0.72x=3.6$ and $x=5$ hits.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.8 - Modeling with Equations - Exercise Set - Page 124: 56
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