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?

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) (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

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