SOLUTION: How many liter of a 10% solution and how many liters of a 20% solution must be mixed to obtain 20 liters of a 17.5% solution?

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Question 306011: How many liter of a 10% solution and how many liters of a 20% solution must be mixed to obtain 20 liters of a 17.5% solution?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x+y=20
.1x+.2y=20*.175