Answer
$10$ hits.
Work Step by Step
Step 1. Assuming you need $x$ number of additional hits, we have $\frac{35+x}{140+x}=0.30$
Step 2. Solving the above equation, we get $35+x=42+0.3x$, $0.7x=7$ and $x=10$ 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: 55
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