College Algebra (10th Edition)

by Sullivan, Michael

Published by Pearson

ISBN 10: 0321979478

ISBN 13: 978-0-32197-947-6

Chapter 1 - Test - Page 147: 13

Answer

$\frac{20}{3}$ punds

Work Step by Step

Let $x$ be the pounds of coffee we mix with it, then our equation becomes: $20\cdot4+x\cdot8=(20+x)\cdot5\\80+8x=100+5x\\8x=20+5x\\3x=60\\x=\frac{20}{3}$

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