SOLUTION: How much pure acid must be added to a 30% acid solution to make a 60L solution which is 50% acid?

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Question 838907: How much pure acid must be added to a 30% acid solution to make a 60L solution which is 50% acid?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
That lesson is here:

http://www.algebra.com/my/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev