SOLUTION: How much 13% saline solution should be added to 80 cc of 23% saline solution in order to have a 17% solution?

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Question 750955: How much 13% saline solution should be added to 80 cc of 23% saline solution in order to have a 17% solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = cc's of 13% solution to be added
+.13x+ = cc's of salt in 13% solution
+.23%2A80+=+18.4+ cc's of salt in 23% solution
----------------
+%28+.13x+%2B+18.4+%29+%2F+%28+x+%2B+80+%29+=+.17+
+.13x+%2B+18.4+=+.17%2A%28+x+%2B+80+%29+
+.13x+%2B+18.4+=+.17x+%2B+13.6+
+.04x+=+4.8+
+x+=+120+
120 cc's of 13% solution need to be added
check:
+%28+.13x+%2B+18.4+%29+%2F+%28+x+%2B+80+%29+=+.17+
+%28+.13%2A120+%2B+18.4+%29+%2F+%28+120+%2B+80+%29+=+.17+
+%28+15.6+%2B+18.4+%29+%2F+200+=+.17+
+34+=+.17%2A200+
+34+=+34+
OK