GIVEN: Average age of 15 persons (14 employees and 1 manager) = 15 years Average age of 14 persons (after manager was excluded) = 14 years FORMULA USED: Total age = Average age × Number of persons CALCULATION: Average age of 15 persons (14 employees and 1 manager) = 15 years Total age of 15 persons = 15 × 15 = 225 years Average age of 14 persons (after manager was excluded) = 14 years Total age of 14 persons = 14 × 14 = 196 ∴ Age of the Manager = 225 – 196 = 29 years