SOLUTION: How many gallons of distilled water must be mixed with 50 gallons of 30% alcohol solution to obtain a 25% solution?

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Question 344575: How many gallons of distilled water must be mixed with 50 gallons of 30% alcohol solution to obtain a 25% solution?
Answer by Jk22(389) About Me  (Show Source):
You can put this solution on YOUR website!
30% alcohol of 50 gallons are 15 gallons alcohol, and 35 gallons water (*)

we should have 25% alcohol, knowing there is 15 gallons alcohol, equals one forth of total, hence total is 4*15=60 gallons.

Water quantity is total minus alcohol, 60-15=45 gallons water.

There should be 45 gallons water, knowing there was already 35 gallons at the beginning (*), we shall add 10 gallons water.