Question

The average age of 10 students is 14 years. One student aged 16 leaves and another aged 20 joins. What is the new average age?

Solution

1. Original total age = 10 x 14 = 140 years.
2. New total = 140 - 16 + 20 = 144 years.
3. New average = 144 / 10 = 14.4 years.