SOLUTION: How much pure acid should be mixed with 6 gallons of 50% acid solution in order to get an 80% acid solution?

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Question 1089684: How much pure acid should be mixed with 6 gallons of 50% acid solution in order to get an 80% acid solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
How much pure acid should be mixed with 6 gallons of 50% acid solution in order to get an 80% acid solution?
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Add G gallons.
Then,
6*50 + G*100 = (6+G)*80