SOLUTION: How many gallons of distilled water must be mixed with 50 gallons of 40% alcohol solution to obtain a 30% solution?

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Question 424439: How many gallons of distilled water must be mixed with 50 gallons of 40% alcohol solution to obtain a 30% solution?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
50x.4=20
.3m=20
m=20/.3=66.6667
66.6667-50=16.6667 gallons of distilled water necessary..