SOLUTION: How many gallons of pure alcohol should be mixed with 20 gallons of a 15 % alcohol solution to obtain a 25% alcohol mixture? It should be two equations that can then be solved usin

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Question 466081: How many gallons of pure alcohol should be mixed with 20 gallons of a 15 % alcohol solution to obtain a 25% alcohol mixture? It should be two equations that can then be solved using substitution or elimination
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
20(.15)+m=.25(20+m)
m+3=5+.25m
.75m=2
m=2/.75=2.67
You need 2.67 gallons of pure alcohol to strengthen your mixture..