SOLUTION: A 4-liter mixture of milk and coffee is 20% milk. A liter of pure coffee is added to this mixture. What percent if the new mixture is milk?

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Question 439563: A 4-liter mixture of milk and coffee is 20% milk. A liter of pure coffee is added to this mixture. What percent if the new mixture is milk?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = % of milk in final mixture
In words:
(total liters of milk) / (total liters of mixture) = % milk
given:
Liters of milk = .2%2A4+=+.8
----------
+.8%2F%281+%2B+4%29+=+x+
+5x+=+.8+
+x+=+.8%2F5+
+.8%2F5+=+16%2F100+
There is 16% milk in the new mixture