DRDO Multi tasking staff Model paper 10

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