SOLUTION: how much water should be added to 10 ML of 19% alcohol solution to reduce the concentration to 5%?

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Question 625542: how much water should be added to 10 ML of 19% alcohol solution to reduce the concentration to 5%?
Answer by lwsshak3(11628) About Me  (Show Source):
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how much water should be added to 10 ML of 19% alcohol solution to reduce the concentration to 5%?
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let x=amt of water to add
19%*10=5%(10+x)
1.9=.5+.05x
.05x=1.4
x=28 ml
amt of water to add=28 ml