SOLUTION: We have a 40% solution and we want 75 liters of a 15% acid solution. How much water should we put into the acid solution to do this?

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Question 979028: We have a 40% solution and we want 75 liters of a 15% acid solution. How much water should we put into the acid solution to do this?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
v is the amount volume in liters of the 40% material to use.
%2840%2Av%2B0%2875-v%29%29%2F%2875%29=15

You would accordingly be looking for 75-v.