SOLUTION: how many gallons of pure alcohol must be added to 5 gallons of 20% alcohol solustion to make a 50% alcohol solution?

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Question 138913: how many gallons of pure alcohol must be added to 5 gallons of 20% alcohol solustion to make a 50% alcohol solution?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
5*.2=1 gallon of pure alcohol + 4 gallons water in 5 gallons of 0.2 alcohol.
So if we add 3 more gallons of pure alcohol we will have 8 gallons of 50% alcohol.
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Ed