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?
Show answer & explanation
Correct answer: B
Explanation
Total Students = 120
Boys = 2 × Girls
Let girls = x
x + 2x = 120 → 3x = 120 → x = 40
Girls = 40, Boys = 80
Rohan is 28th from top → 27 ahead
Girls ahead = 18
So boys ahead = 27 − 18 = 9
Total boys = 80
Boys ahead = 9
Boys behind = 80 –( 9 – 1) = 70
Hence, the correct answer is option 2.