SOLUTION: how much water should be added to 24 mL of 17% alcohol solution to reduce the concentration to 12%?

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Question 337533: how much water should be added to 24 mL of 17% alcohol solution to reduce the concentration to 12%?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Water is a 0% solution.
Let A be the amount of water added.
0%28A%29%2B17%2824%29=12%28A%2B24%29
408=12A%2B288
12A=120
A=10ml