UGC NET General Q35

Question

The number of students in four classes A, B, C, D and their respective mean marks obtained by each of the class are given below:
Class A
            
Class B
            
Class C
            
Class D
Number of students    10                    40                    30                    20
Arithmetic mean         20                    30                    50                    15
The combined mean of the marks of four classes together will be:

Accepted Answer

32