SOLUTION: how much water should be added to 12 mL of 7% alcohol to reduce concentration to 6%?

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Question 898261: how much water should be added to 12 mL of 7% alcohol to reduce concentration to 6%?
Answer by lwsshak3(11628) About Me  (Show Source):
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how much water should be added to 12 mL of 7% alcohol to reduce concentration to 6%?
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let x=amt of water to add
7%*12=6%(12+x)
.84=.72+.06x
.06x=.12
x=2
how much water should be added to 12 mL of 7% alcohol to reduce concentration to 6%? 2 ML