Get ready for your quantitative check-up! As always, we’d like to thank ManhattanGMAT for providing this week’s Challenge Question and – more importantly – tomorrow’s answer!
Question
A medical test for a certain liver enzyme can be given in the morning, in the afternoon, or in the evening; moreover, the result of the test can be low, average, or high. At least three-quarters of low and medium readings are not given in the evening. Sixty percent of exams are given in the morning or in the afternoon, and 20% of exams result in a high reading. What percent of exams given in the evening result in low or medium readings?
(A) 20%
(B) 30%
(C) 40%
(D) 50%
(E) 60%
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