SOLUTION: how much pure acid should be mixed with 3 gallons of a 60% acid solution in order to get 90% acid solution

Question 501139: how much pure acid should be mixed with 3 gallons of a 60% acid solution in order to get 90% acid solution
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
In words:
( gallons of acid you end up with ) / ( total gallons of solution ) = 90%
Let = gallons of pure acid to be added
given:
= gallons of acid in 60% solution
= total gallons of solution
-------------

9 gallons of pure acid need to be added
check answer:

OK
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