SOLUTION: A physician advised the nurse to decrease the antibiotic solution for a newly born baby from 25% to 16%. How much distilled water must be added to 500 cc of 25% solution to get 16%

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Question 825944: A physician advised the nurse to decrease the antibiotic solution for a newly born baby from 25% to 16%. How much distilled water must be added to 500 cc of 25% solution to get 16% solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+.25%2A500+=+125+ cc of antibiotic in 25% solution
Let +w+ = cc of water to be added
-----------------
+125+%2F+%28+500+%2B+w+%29+=+.16+
+125+=+.16%2A%28+500+%2B+w+%29+
+125+=+80+%2B+.16w+
+.16w+=+125+-+80+
+.16w+=+45+
+w+=+45%2F.16+
+w+=+281.25+
281.25 cc of water must be added
check:
+125+%2F+%28+500+%2B+w+%29+=+.16+
+125+%2F+%28+500+%2B+281.25+%29+=+.16+
+125+%2F+781.25+=+.16+
+125+=+.16%2A781.25+
+125+=+125+
OIK