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 431111: how many grams of alcohol must be added to 40 grams of a 15% alcohol solution to obtain a 20% alcohol solution
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
1.0x+40(.15)=.20(40+x)
x+6=8+.2x
.8x=2
x=2/.8=2.5
You must add 2.5 gms of pure alcohol to get the mix..