Out of 10 teachers of a school, one teacher retires and in his place, a new teacher of age 25 years joins. As a result, average age of teachers reduces by 3 years. The age of the retired teacher is
Options:
A . 55 years
B . 50 years
C . 60 years
D . 58 years
Answer: Option A Answer: (a)Total age decreased = 10 × 3 = 30 years. ∴ Age of the retired teacher = 25 + 30 = 55 years. Aliter : Using Rule 23, Here, n = 10, x = 3 Age of new teacher = Age of retired teacher – xn 25 = Age of retired teacher – 10 × 3 = Age of retired teacher = 25 + 30 = 55 years
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