SSC GD Constable 5 Feb 2025 Shift 2 Paper

Total age = Average age × Total number of individuals
Teacher's age = Total age ( with teacher )− Total age (without teacher)
Calculation:
Total age of 30 students =18×30
Total age of 30 students = 540
Total age of group (with teacher) =19×31
Total age of group (with teacher) =589
Teacher's age = Total age ( with teacher )− Total age (without teacher)
⇒ Teacher's age =589−540
⇒ Teacher's age =49