SOLUTION: What quantity of pure acid must be added to 300 mL of a 50% acid solution to produce a 60% acid solution?

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Question 349475: What quantity of pure acid must be added to 300 mL of a 50% acid solution to produce a 60% acid solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 100% acid.
100A%2B50%28300%29=60%28A%2B300%29
100A%2B15000=60A%2B18000
40A=3000
highlight%28A=75%29ml