SOLUTION: What quantity x of a 65% acid solution must be mixed with a 20% solution to produce 300mL of a 45% solution?

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Question 340238: What quantity x of a 65% acid solution must be mixed with a 20% solution to produce 300mL of a 45% solution?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
x * .65 =======.65x
(300-x) * .20==60-.2x
300 * 0.45====135
.65x+60-.2x=135
.45x=75
x=166 2/3 ml.
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Ed