The average marks of 60 students in a class are 62. The average marks of boys and girls in that subject are 60 and 65, respectively. The number of boys in the class is :
Answer & explanation
Correct answer: option 1
Lets assume
No. of Boys in the class = n
So, No. of girls in the class = 60 - n
As Average marks of the class will remain same
60 x 62 = 60 x n + 65 x (60 - n)
5n = 180
n = 36
No. of boys in the class are 36