SOLUTION: How many gallons of pure alcohol should be mixed with 20 gal of 15% alcohol solution to obtain a mixture that is 25% alcohol?

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Question 429929: How many gallons of pure alcohol should be mixed with 20 gal of 15% alcohol solution to obtain a mixture that is 25% alcohol?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
x+20(.15)=(x+20).25
x+3=.25x+5
.75x=2
x=2/.75=2.67
You must mix 2.67 gals. of pure alcohol to obtain the desired mixture..