SOLUTION: How much water do you add to 50 gallons 0f 80% acid solution if you want to end up with a 65% acid solution?

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Question 611186: How much water do you add to 50 gallons 0f 80% acid solution if you want to end up with a 65% acid solution?
Answer by josmiceli(9669) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = gallons of water to be added
+.8%2A50+=+40+ gallons of acid in 80% solution
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+40+%2F+%28+x+%2B+50%29+=+.65+
+40+=+.65%2A%28+x+%2B+50+%29+
+40+=+.65x+%2B+32.5+
+.65x+=+7.5+
+x+=+11.538+
11.538 gallons of water must be added