SOLUTION: I have 10 liters of solution that is 20% salt. How much water needs to be added to reduce the strength to 5% salt?

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Question 711427: I have 10 liters of solution that is 20% salt. How much water needs to be added to reduce the strength to 5% salt?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = liters of water to be added
+.2%2A10+=+2+ liters of salt in 20% solution
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+2+%2F+%28+w+%2B+10+%29+=+.05+
+2+=+.05%2A%28+w+%2B+10+%29+
+2+=+.05w+%2B+.5+
+.05w+=+1.5+
+w+=+30+
30 liters of water need to be added