Class A has 20 students scoring average marks of 75, and class B has 30 students scoring average marks of 60. What is the average of both the classes together?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 66.
Class A total = 20 × 75 = 1500
Class B total = 30 × 60 = 1800
Total students = 20 + 30 = 50
Total marks = 1500 + 1800 = 3300
Average = Total Marks/Total Students = 3300/50 = 66