Out of 72 students, boys are twice girls. A girl is ranked 12th from top. If 5 boys are ahead of her, how many girls are after her?
Show answer & explanation
Correct answer: A
Explanation
Total students = 72
Boys = 2 × Girls
Let girls = x
So, x + 2x = 72 → 3x = 72 → x = 24
Girls = 24, Boys = 48
Students above her:
Rank = 12th from top → 11 students ahead
Given boys ahead = 5
So girls ahead = 11 − 5 = 6
Girls after her:
Total girls = 24
Girls ahead = 6
Include her = 1
Girls after = 24 − (6 + 1) = 17
Hence, the correct answer is option 1.