In a class of 60 where girls are twice to that of boys. Annu , a girl 20th from the top. If there are 12 girls ahead of her then, how many boys are after her?
Answer & explanation
Correct answer: option 2
Number of girls are twice to that of boys.
i.e. G = 2B
Total number of students = 60
G + B = 60
2B + B = 60
3B = 60
B= 20 ( number of boys)
G= 40 ( number of girls )
Now,
Annu is 20th from top and 12 girls are ahead of her . Till 20 there are 13 girls .
That means there are 7 boys ahead of her .
So, number of boys after Annu = total number of boys - number of boys ahead of her
= 20 - 7 = 13