SOLUTION: Let's say that a 6-ounce cup of coffee is 20 percent milk. If you add 3 ounces of coffee, what is the percentage of milk in the new mixture?

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Question 664408: Let's say that a 6-ounce cup of coffee is 20 percent milk. If you add 3 ounces of coffee, what is the percentage of milk in the new mixture?
Answer by Sacrifice(3) About Me  (Show Source):
You can put this solution on YOUR website!
You can do this in a proportion
6/20 and 9/x with x and 20 as the denominators. Then you cross multiply to get to 6x=180
Then divide and you will get
x=30
I hope this helps if you have any questions email me. :)