Correct option is B
Given:
The average age of 35 students is 15 years.
When the teacher's age is included, the average age increases by 1 year.
Solution:
Total age of 35 students = Average age × Number of students
Total age of 35 students = 15×35=525 years
New average age when the teacher is included:
New average age=16 years
Now,
Total age of 36 individuals = New average age × Number of individuals
Total age of 36 individuals=16×36=576 years
The teacher's age:
Teacher’s age=Total age of 36 individuals−Total age of 35 students
Teacher’s age=576−525=51 years
The age of the teacher is 51 years.
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