In a class of 40 students, the number of students who passed the math exam is equal to half the
number of students who passed the science exam. Each student in the class passed at least one of the
two exams. If 5 students passed both exams, then the number of students who passed the math exam is
(A) 5 (B) 10 (C) 15 (D) 20 (E) 25
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