SOLUTION: How much 8% saline solution should Mary mix with 80cc of an 18% saline solution to produce a 12% saline solution?

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Question 584123: How much 8% saline solution should Mary mix with 80cc of an 18% saline solution to produce a 12% saline solution?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.08x+.18*80=(80+x)*.12
x=120 cc