SOLUTION: how much pure acid should be mixed with 3 gallons of 20% acid solution to get a 40% acid solution?

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Question 753680: how much pure acid should be mixed with 3 gallons of 20% acid solution to get a 40% acid solution?
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
unknown amt: x
20% acid: 3(0.2)
new mixture: (x+3)(0.4)
%0D%0Ax%2B%283%29%280.2%29=%28x%2B3%29%280.4%29%0D%0A

x=1




:)