SOLUTION: how much water needs to be added to 3 quarts of 96% alcohol to produce a mixture that is 75% alcohol? (concentration of alcohol in water is 0%)

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Question 290698: how much water needs to be added to 3 quarts of 96% alcohol to produce a mixture that is 75% alcohol? (concentration of alcohol in water is 0%)
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
There are at least two approaches to this problem.
From the view of alcohol or from the view of water.
Alcohol view
3*.96=(x+3)*.75
x=.84 quarts
Water view
3*(.04+x)=.25(x+3)
x=.84 quarts
They serve as a check on each other.