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A class has 120 students. Number of boys is twice that of girls. Rohan is ranked 28th from the top. If there are 18 girls ahead of him, how many boys
Question

A class has 120 students. Number of boys is twice that of girls. Rohan is ranked 28th from the top. If there are 18 girls ahead of him, how many boys are behind him? ​​

A.

50

B.

70

C.

53

D.

54

Correct option is B

Given
A class has 120 students.
Number of boys is twice that of girls.
Rohan is ranked 28th from the top.
If there are 18 girls ahead of him.
Solution:
Total students = 120.
Boys : Girls = 2 : 1 → Girls = 40, Boys = 80.
Rohan is 28th from top.
Ahead of him are 27 students; 18 of those are girls → boys ahead = 27 − 18 = 9.
Rohan is a boy, so boys remaining behind him = 80 − 9 − 1 = 70.
So, 70 boys are behind him.
Thus, correct option is (b).

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