SOLUTION: How many milliliters of a 8% alcohol solution must be added to 15 milliliters of a 28% alcholol solution to produce a 20% alcohol solution?

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Question 353020: How many milliliters of a 8% alcohol solution must be added to 15 milliliters of a 28% alcholol solution to produce a 20% alcohol solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the milliliters of a 8% alcohol solution.
8A%2B28%2815%29=20%28A%2B15%29
8A%2B28%2815%29=20A%2B20%2815%29
12A=%2828-20%29%2815%29
4A=8%285%29
highlight%28A=10%29ml