SOLUTION: I want to make 200 LIters of a 5% acid solution. If I have a 25% acid solution, how much water and how much of the 25% acid solution should I use?

Question 708332: I want to make 200 LIters of a 5% acid solution. If I have a 25% acid solution, how much water and how much of the 25% acid solution should I use?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
EDIT: Added explanation after the end.

Water with "nothing else" in it will have 0% acid. You have 25% acid and you want to add water, of 0% acid to make 5% acid.

How much acid will be?
How much volume of mixture will result?
What concentration of acid must result?
----------> Rational Equation:

Let x be how much water
Let y be how much 25% acid

AND

Solve for y in the rational equation. Use that result in the volume sum equation to find x.

FURTHER EXPLANATION: The reason I said that last part is because in the rational equation. This means the rational equation only has one variable, the y. One single linear y, easy to solve. Then use the volume sum equation to find x.
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