SOLUTION: how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution?

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Question 899512: how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution?
Answer by swincher4391(1107) About Me  (Show Source):
You can put this solution on YOUR website!
Let x represent the amount of pure acid.

Then the equation is

100%x + 40%(2) = 70%(x+2)
1x + .8 = .7x + 1.4
.3x = 0.6
x = 2