SOLUTION: What quantity of 30% acid solution must be mixed with 480 mL of 90% acid solution to produce 80% acid solution?

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Question 961237: What quantity of 30% acid solution must be mixed with 480 mL of 90% acid solution to produce 80% acid solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Mixture: one material quantity unknown
http://www.algebra.com/my/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev