SOLUTION: How much pure acid should be mixed with 4 gallons of a 50% acid solution in order to get an 80% acid solution?

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Question 844890: How much pure acid should be mixed with 4 gallons of a 50% acid solution in order to get an 80% acid solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Just with that information, we could expect the percents to be as w/v.

Let v = how much volume of the pure acid to add

%2850%2A4%2B100v%29%2F%28v%2B4%29=80
Solve for v

Study this lesson to understand better:
http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev