SOLUTION: One solution contains 40% alcohol. A second contains 60%. You need 20 L of a 45% solution. How many L of the 40% should be used?

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Question 1053324: One solution contains 40% alcohol. A second contains 60%. You need 20 L of a 45% solution. How many L of the 40% should be used?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x, how much of the 40% to use.
20-x, how much of the 60% to use.

%2840x%2B60%2820-x%29%29%2F20=45