SOLUTION: a vat contains 400 L of a solution that is 32% acid. how much water should be added to make a solution that is 25% acid?

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Question 835324: a vat contains 400 L of a solution that is 32% acid. how much water should be added to make a solution that is 25% acid?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Water contains 0% acid.

%28400%2A32%2Bw%2A0%29%2F%28400%2Bw%29=25

That will be the same as %28400%2A32%29%2F%28w%2B400%29=25
Solve for w.

You can understand this more clearly in the lesson "Mixture: one material quantity unknown" which you can find through my profile.