SOLUTION: How much water must be added to 20 quarts of a 12% alcohol solution to dilute it to a 9% solution?

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Question 718653: How much water must be added to 20 quarts of a 12% alcohol solution to dilute it to a 9% solution?
Answer by lwsshak3(11628) About Me  (Show Source):
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How much water must be added to 20 quarts of a 12% alcohol solution to dilute it to a 9% solution?
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let x=amt of water to add
12%*20+0%x=9%(20+x)
2.4=1.8+.09x
.09x=0.6
x=0.6/.09=6-2/3
amt of water to add=6-2/3 quarts