The average age of 26 students in a class is 37 years. If the age of the teacher is also included, the average age of the whole group becomes 38 years. The age (in years) of the teacher is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 64.
The age of the teacher = 37 + 27(38 - 37) = 37 + 27 = 64