SOLUTION: How much pure alcohol must be added to 2 liters of a 30% solution to get a 50% alcohol solution

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Question 809805: How much pure alcohol must be added to 2 liters of a 30% solution to get a 50% alcohol solution
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.3*2+x=.5(2+x)
.6+x=1+x/2
x/2=.4
x=.8