There are 80 students in a class, where number of boys are thrice the number of girls. Surinder ranked 20th from the top. If there are 11 girls ahead of Surinder, how may boys are after him in rank?

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  1. 49
  2. 51
  3. 53
  4. 55

Answer (Detailed Solution Below)

Option 2 : 51
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Total no. of students = 80

Given, the number of boys is thrice the number of girls.

Thus, No. of girls = 20 and

No. of boys = 60

Since Surinder’s rank is 20 and 11 girls are ahead of Surinder.

Hence, no. of girls upto 20th rank from top = 20 – 11 = 9.

Therefore, no. of boys after the rank of Surinder = 60 – 9 = 51.

Hence, the correct answer is "51".

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