Answer
$7.5$ pounds
Work Step by Step
Let $x$ be the pounds of $7\%$ fat hamburger. Then our equation is: $0.07x+12\cdot0.2=(12+x)0.15\\0.07x+2.4=1.8+0.15x\\0.6=0.08x\\x=7.5$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 3 - Section 3.1 - Functions - 3.1 Assess Your Understanding - Page 213: 120
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