SOLUTION: A 50 milliliter solution of acid and water contains 25% acid. How much water do you need to add in order to make a 10% acid solution?

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Question 528169: A 50 milliliter solution of acid and water contains 25% acid. How much water do you need to add in order to make a 10% acid solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = ml of water needed
given:
+.25%2A50+=+12.5+ ml of acid in 25% solution
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+12.5+%2F+%28+50+%2B+w%29+=+.1+
+12.5+=+.1%2A%28+50+%2B+w+%29+
+12.5+=+5+%2B+.1w+
+.1w+=+12.5+-+5+
+w+=+7.5+%2F+.1+
+w+=+75+
75 ml of water is needed