SOLUTION: how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get an 80% acid solution?

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Question 759003: how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get an 80% acid solution?
Answer by Alan3354(69443) About Me  (Show Source):
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how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get an 80% acid solution?
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2*40 + x*100 = (2+x)*80