SOLUTION: how much water should be added to 18ml of 13% alcohol solution to reduce the concentration to 9%?

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Question 458617: how much water should be added to 18ml of 13% alcohol solution to reduce the concentration to 9%?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
from the view of alcohol
.13*18=.09*(18+x)
8 ml. of water
from the view of water
.87*18+x=.91*(18+x)
8 ml of water again