Question

if the avarage of 40student in a class is 12 year, if the age of the teacher is added to the age of the students, the avarage increase by 1. find the age of the teacher

Answer 1

Age of teacher is to be 53

Answer 2

Average of age of 40 students = Sum of ages of 40 students /40

=12=Sum of ages of 40 students /40

=12*40= Sum of ages of 40 students

=480= Sum of ages of 40 students

If the age of the teacher is added to the age of the students,

Average = Sum of ages of 40 students + Age of teacher /41

= 13= 480 + Age of teacher /41

=13*41=480+ Age of teacher

=533=480+ Age of teacher

=533-480= Age of teacher

Age of teacher = 53. It's solved.