SOLUTION: What quantity of a 50% acid solution must be mixed with a 20% solution to produce 600 mL of a 40% solution?

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Question 852668: What quantity of a 50% acid solution must be mixed with a 20% solution to produce 600 mL of a 40% solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
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Same general question, different example. Learn this:
Mixing two concentrations for known amount of mixture