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If the ratio of the number of students who wrote the exams in schools A and F is 8:13, then what is the ratio of the number of students in A and F who did not pass?

A.	23:16	B.	21:23
C.	16:21	D.	17:21
E.	21:17

Answer and Explanation

Answer:16:21

Explanation:
ratio of the total number of students in A and F = 8/13.
=> Ratio of the number of students, who failed, in both the schools
=> = 8 x 52 / 13 x 42 = 16 : 21

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