SOLUTION: how many ounces of pure water must be mixed with 50 ounces of a 15% saline solution to make a solution that is 10% salt?

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Question 547835: how many ounces of pure water must be mixed with 50 ounces of a 15% saline solution to make a solution that is 10% salt?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let w = ounces of pure water needed
given:
+.15%2A50+=+7.5+ = ounces of salt in 15% solution
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+7.5+%2F+%28+50+%2B+w+%29+=+.1+
+7.5+=+.1%2A%28+50+%2B+w+%29+
+7.5+=+5+%2B+.1w+
+.1w+=+2.5+
+w+=+25+
25 ounces of pure water are needed