Question

The average age of 30 boys in class and a teacher is 15. If the age of the teacher is 30 year what
would be the average age of boys only ?
(a) 15 (b) 14 (c) 13 (d) 16

Answer 1

boys + teacher = 30 + 1 = 31 person

total age = 31 × 15 = 465

total boys age = 465 - 30 = 435

average age of boys = 435/30 = 14.5 yers