SOLUTION: How many liters each of 8%, 10%, and 20% hydrogen peroxide should be mixed together to get 8 liters of 12.5% solution, if the amount of 8% solution used must be 2 liters more than

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Question 822679: How many liters each of 8%, 10%, and 20% hydrogen peroxide should be mixed together to get 8 liters of 12.5% solution, if the amount of 8% solution used must be 2 liters more than the amount of 20% solution used?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a+b+c=8,
a=c+2,
.08a+.1b+.20c=8*.125
a = 5, b = 0, c = 3