SOLUTION: how much water must be added to 8 gallons of 80% boric acid solution to reduce it to a 50% solution?

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Question 580831: how much water must be added to 8 gallons of 80% boric acid solution to reduce it to a 50% solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = gallons of water to be added
+.8%2A8+=+6.4+ gallons of boric acid in 80% solution
+6.4+%2F+%28+x+%2B+8+%29+=+.5+
+6.4+=+.5%2A%28+x+%2B+8+%29+
+6.4+=+.5x+%2B+4+
+.5x+=+6.4+-+4+
+.5x+=+2.4+
+x+=+4.8+
4.8 gallons of water must be added