There are 50 students in Class 52. In a math exam, the average grade of the whole class was 9. 1 1.02. The average score for boys is 90.5 for girls.
Let the number of boys be x and the number of girls be (50-x).
90.5x+92(50-x)=9 1.22×50
The solution is x=26.
50 x = 24
So there are two more boys than girls.