In a class of 180, when girls are twice the number of boys, Rupesh (a boy) ranked 34 thfrom top. If there are 18 girls ahead of Rupesh, how many boys are after him in rank?

Let us assume the number of boys in school be B.
Then number of girls in school = 2B
According to question,
B + 2B = 180
3B = 180
B = 180/3 = 60
Number of boys = 60
Number of girls = 120
Rupesh (a boy) ranked 34^th from top and 18 girls are ahead of Rupesh.
Number of boys after the rank of Rupesh = 60 – 16 = 44