Question

The avg age 20 employees in a factory is 30 years.if the supervisior age is added,the average age is increase by one. what is the age of the supervisior?

Answer 1

Avg.= Sum of ages of people /No of people
30= Sum of ages of people /20
Sum of age of people = 20*30=600
New avg =31(when supervisors age is also added it increases by one )
No of people = 21
Sum of ages = 31*21
=651
Age of supervisor = 651-600=51