Answer
You need 400 ounces of the self-tanning lotion.
Work Step by Step
$0.3*800+3x=1.20*(800+x)$
$240+3x=960+1.2x$
$1.8x=720$
$x=400$
Therefore, you need 400 ounces of the self-tanning lotion.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 2 - Section 2.6 - Percent and Mixture Problem Solving - Exercise Set - Page 162: 59
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