SOLUTION: How much water should be added to 10 ml of 15% alcohol solution to reduce the concentration to 5%

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Question 834067: How much water should be added to 10 ml of 15% alcohol solution to reduce the concentration to 5%
Answer by josmiceli(19441) About Me  (Show Source):
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+.15%2A10+=+1.5+ ml of alcohol in 15% solution
Let +w+ = ml of water to be added
+1.5+%2F+%28+10+%2B+w+%29+=+.05+
+1.5+=+.05%2A%28+10+%2B+w+%29+
+1.5+=+.5+%2B+.05w+
+.05w+=+1+
+w+=+20+
20 ml of water must be added