NIELIT 2022 Feb Scientist C - Section D: 23

Question

The average age of a teacher and $25$ students is $17$ years. If the teacher’s age is excluded, the average reduces by $2$ years. The age of the teacher is :

• A. $63$ years
• B. $65$ years
• C. $67$ years
• D. $69$ years

Answer 1

the average age of teachers +$25$  students=$17*26=442$

The average age of $25$ students=$25*15=375$

So the age of the teacher =$442-375=67$ year

Option $(C)$ is correct.