SOLUTION: Anne had two solutions that contain 20% citric acid and 45% citric acid. How many liters of each solution must she mix to produce 20 liters of a 30% citric acid solution?

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Question 835284: Anne had two solutions that contain 20% citric acid and 45% citric acid. How many liters of each solution must she mix to produce 20 liters of a 30% citric acid solution?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
u = volume of 20%
v = volume of 45%

%2820u%2B45v%29%2F20=30 and u%2Bv=20
Solve for u and v.

How those are formed, found in the lesson, "Mixing two concentrations for known amount of mixture"