SOLUTION: If I have a .5% solution how much water do I have to add to make it a .03% solution?

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Question 619854: If I have a .5% solution how much water do I have to add to make it a .03% solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
I'll say you have 1 gallon of solution
Let +w+ = gallons of water to be added
+.005+%2F+%28+w+%2B+1+%29+=+.0003+
+.005+=+.0003%2A%28+w+%2B+1+%29+
+.005+=+.0003w+%2B+.0003+
+.0003w+=+.005+-+.0003+
+.0003w+=+.0047+
+w+=+15.667+ gallons ( or whatever units you want to use )