SOLUTION: How much pure alcohol must be added to 10 gallons of 35% alcohol to have a solution that is 60% alcohol?

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Question 478648: How much pure alcohol must be added to 10 gallons of 35% alcohol to have a solution that is 60% alcohol?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(10)(35%) + (x)(100%) = (10 + x)(60%)