Of the final grades received by the students in a certain math course, 1/5 are A's, 1/4 are B's, 1/2 are C's, and the remaining 10 grades are D's. What is the number of students in the course?
(A) 80
(B) 110
(C) 160
(D) 200
(E) 400
OA D
Source: Official Guide
Of the final grades received by the students in a certain math course,
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