SOLUTION: How many gallons of a 40% alcohol solution must be mixed with 30 gallons of a 25% solution to obtain a solution that is 30% alcohol?

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Question 441057: How many gallons of a 40% alcohol solution must be mixed with 30 gallons of a 25% solution to obtain
a solution that is 30% alcohol?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.40x+30*.25=.30(x+30)
.4x+7.5=.3x+9
.1x=2.5
x=2.5/.1=25 gallons..