Answer
$10$
Work Step by Step
Step 1. Assume we solved correctly $x$ number of problems; then we did incorrectly for $26-x$ problems.
Step 2. Based on the given condition, we have $8x=5(26-x)$, which gives $x=10$
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 125: 68
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