In a class of 60 students where the number of girls is twice that of boys Kamal a boy ranked sevente...........

Logical Reasoning and Analytical Ability (CSP) Ranking and ordering

In a class of 60 students, where the number of girls is twice that of boys, Kamal, a boy, ranked seventeenth from the top. If there are 9 girls ahead of Kamal, the number of boys in rank after him is:

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Explanation:

The number of girls is twice that of boys in a class of 60 students. Hence number of girls is 40 and boys is 20.
Now, Kamal is seventeenth from the top. Therefore there are 16 students ahead of Kamal out of which 9 girls, and so 7 are boys (16 - 9 = 7).
Therefore 20 – 7 – 1 (himself) = 12 boys will be ranked after Kamal. Hence option (b) is the correct answer.