Question

The average marks of 20 students is 68 and the average marks of 30 students is 72. What is the average marks of all 50 students?

Solution

1. Total marks of the first group = 20 x 68 = 1,360.
2. Total marks of the second group = 30 x 72 = 2,160.
3. Combined average = (1,360 + 2,160) / 50 = 70.4.