SOLUTION: 1 gallon of an alcohol solution was mixed with a 3 gallon of pure water to make a 7% alcohol solution. Find the perecent concentration of the first solution. Please help. T

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Question 433834: 1 gallon of an alcohol solution was mixed with a 3 gallon of pure water to make a 7% alcohol solution. Find the perecent concentration of the first solution.
Please help.

Thanks,
Tyler
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
x+3=4(.93) percent water
x+3=3.72 gallons water
.28 gallons alcohol
You need to add 1 gallon of 28% alcohol to get the desired mixture..