Precalculus (6th Edition) Blitzer

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

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 $x=10$
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