Correct Answer - Option 3 : 46 years
Given :
A class the average age of 30 students = 15 years
the teacher is included then the average age is increased = 1 year
Formula Used
Average = sum of observation/No. of observation
Calculation :
total age of students = 30 × 15 = 450
⇒ Total age with teacher = 31 × 16 = 496
⇒ Age of teacher = 496 – 450= 46 years.
∴ The age of the teacher is 46 years.