SOLUTION: Forty litres of 50% acid solution should be mixed with 20% acid solution. How much of the 20% acid solution must be used so that the resulting solution contains only 40% acid?

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Question 1115464: Forty litres of 50% acid solution should be mixed with 20% acid solution. How much of the 20% acid solution
must be used so that the resulting solution contains only 40% acid?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
x, the volume of the 20% acid material to use:
The volume of final blend will be x%2B40
50%2A40%2B20%2Ax=40%28x%2B40%29