SOLUTION: A 4.5 ml solution that is 40% saline is mixed with 2.7 ml of pure water. What is the concentration of the mixture?

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Question 989204: A 4.5 ml solution that is 40% saline is mixed with 2.7 ml of pure water. What is the concentration of the mixture?
Answer by josmiceli(19441) About Me  (Show Source):
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+.4%2A4.5+=+1.8+ ml of salt in 40% solution
concentration = +1.8+%2F+%28+4.5+%2B+2.7+%29+=+1.8+%2F+7.2+
+1.8+%2F+7.2+=+1%2F4+
+.25%2A100+=+25+
The concentration is 25%