SOLUTION: how much water should be added to 10liter of 50% acid solution to dilute it to a 20% solution

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Question 540470: how much water should be added to 10liter of 50% acid solution to dilute it to a 20% solution
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = liters of water to be added
given:
+.5%2A10+=+5+ liters of acid in 50% solution
+5+%2F+%28+10+%2B+w+%29+=+.2+
+5+=+.2%2A%28+10+%2B+w+%29+
+5+=+2+%2B+.2w+
+.2w+=+3+
+w+=+3%2F.2+
+w+=+15+
15 liters of water must be added