Average age of a group of 16 boys is 20 years. Two boys with ages 18 years and 19 years left the group. One boy with age 32 years joined the group. What is the new average age (in years) of the group?
Show answer & explanation
Correct answer: A
Explanation
Initial total age = 16 × 20= 320
New total age = 320 - 18 - 19 + 32= 315
Number of new boys = 15
New average age = 315 / 15= 21 years