Correct Answer - Option 1 : 45
Given:
Total number of boys in class X(A) = 32
Average marks of the boys in class X(A) = 60
Total number of boys in class X(B) = 40
Average marks of the boys in class X(B) = 33
Formula Used:
Average marks of all the boys in the class = Total marks of the all the boys in the class/Number of boys in the class
Calculation:
Total marks of Class X(A) = 32 × 60 = 1920
Total marks of Class X(B) = 33 × 40 = 1320
Total of the marks of both the classes = 1920 + 1320 = 3240
Total number of boys in both the classes = 32 + 40 = 72
Required Average = 3240/72 = 45
∴ The required average is 45.