SOLUTION: how many grams of alcohol must be added to 40 grams of a 15% alcohol solution to obtain a 20% alcohol solution

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Question 360912: how many grams of alcohol must be added to 40 grams of a 15% alcohol solution to obtain a 20% alcohol solution
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the number of grams of 100% alcohol.
100A%2B15%2840%29=20%28A%2B40%29
100A%2B600=20A%2B800
80A=200
A=200%2F80
highlight%28A=5%2F2%29 grams