#### 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.

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

You need 400 ounces of the self-tanning lotion.

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