SOLUTION: How much pure acid should be mixed with 7 gallons of a 40% acid solution in order to get a 70% acid solution?

Question 743709: How much pure acid should be mixed with 7 gallons of a 40% acid solution in order to get a 70% acid solution?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Pure acid would be 100%.

How much as the quantity v of pure material should be mixed with u gallons of a L% solution in order to get a T% solution?

Known: u, L, T
Unknown: v

EQUATION:

FIND VALUE FOR v:
Substitute the values from the original problem description and evaluate.
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