SOLUTION: how many liters of a 10% alcohol solution must be mixed with 40 liters of a 50% sotion to get a 40% solution?

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Question 387368: how many liters of a 10% alcohol solution must be mixed with 40 liters of a 50% sotion to get a 40% solution?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
x(10%) + 40(50%) = (40 + x)(40%)