Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 1 - Mixed Review Exercises: 8

Answer

$x=300$

Work Step by Step

Using the properties of equality, the solution to the given equation, $ 0.05x+0.03(1200-x)=42 ,$ is \begin{array}{l}\require{cancel} 100\left[ 0.05x+0.03(1200-x) \right]=(42)100 \\\\ 5x+3(1200-x)=4200 \\\\ 5x+3600-3x=4200 \\\\ 5x-3x=4200-3600 \\\\ 2x=600 \\\\ x=\dfrac{600}{2} \\\\ x=300 .\end{array}
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