SOLUTION: how many quarts of pure acid must be added to 5 quarts of 30% acid solution to produce a 50% acid solution?

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Question 386496: how many quarts of pure acid must be added to 5 quarts of 30% acid solution to produce a 50% acid solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Pure acid is a 100% solution.
Let A be the amount of pure acid added.
100A%2B30%285%29=50%28A%2B5%29
100A%2B150=50A%2B250
50A=100
highlight%28A=2%29quarts