SOLUTION: How much pure acid shold be mixed with 7 gallons of a 40% acid solution in order to get a 80% acid solution?

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Question 1084679: How much pure acid shold be mixed with 7 gallons of a 40% acid solution in order to get a 80% acid solution?
Answer by josgarithmetic(39618)   (Show Source): You can put this solution on YOUR website!

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---------fourteen gallons of pure acid

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