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prealgebra intermediate

Problem

Joe and JoAnn each bought ounces of coffee in a ounce cup. Joe drank ounces of his coffee and then added ounces of cream. JoAnn added ounces of cream, stirred the coffee well, and then drank ounces. What is the resulting ratio of the amount of cream in Joe's coffee to that in JoAnn's coffee?
(A)
(B)
(C)
(D)
(E)
Solution
After drinking and adding cream, Joe's cup has ounces of cream. After adding cream to her cup, JoAnn's cup had ounces of liquid. By stirring and then drinking ounces out of the ounces of liquid, she drank th of the cream. So there are ounces of cream left. So the desired ratio is: .
Final answer
E