College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 8 - Review Exercises - Page 635: 56


See below.

Work Step by Step

Let $x$ be the amount of $6$ pound coffee, then $100-x$ is the amount of $9$ pound coffee, then our equation is: $6x+(100-x)9=100\cdot6.9\\6x+900-9x=690\\-3x=-210\\x=70$ Thus we mix $70$ pounds of $6$ pound coffee and $30$ pounds of $9$ pound coffee.
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