SOLUTION: how much 9% saline solution should Kent mix with 80 cubic centimeter (cc) of a 18% saline solution to produce a 12% saline solution?

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Question 1145027: how much 9% saline solution should Kent mix with 80 cubic centimeter (cc) of a 18% saline solution to produce a 12% saline solution?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
9x%2B18%2A80=12%28x%2B80%29
Simplify and solve.