SOLUTION: What quantity of pure acid must be added to 600 mL of a 30% acid solution to produce a 60% acid solution?

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Question 837618: What quantity of pure acid must be added to 600 mL of a 30% acid solution to produce a 60% acid solution?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
%28100p%2B30%2A600%29%2F%28p%2B600%29=60

One of my lessons specifically deals with this form of mixture. See my lessons link.