SOLUTION: A laboratory technician needs to make a 36-liter batch of a 40% acid solution. How can the laboratory technician combine a batch of an acid solution that is pure acid with another

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Question 994589: A laboratory technician needs to make a 36-liter batch of a 40% acid solution. How can the laboratory technician combine a batch of an acid solution that is pure acid with another that is 20% to get the desired concentration?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Those are all the same question, but just slightly different examples.

x, volume of the 20% acid
36-x, volume of the 100% acid

20%2Ax%2B100%2836-x%29=36%2A40