SOLUTION: How much 40% disinfectant solution must be mixed with a 80% disinfectant solution to produce 25 gallons of a 56% disinfectant solution?

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Question 522340: How much 40% disinfectant solution must be mixed with a 80% disinfectant solution to produce 25 gallons of a 56% disinfectant solution?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.4x+.8y=.56*25
x+y=25