The average age of 26 students of a class is 43 years. If the age of the teacher is also included, the average age of the whole group becomes 44 years. The age (in years) of the teacher is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 70.
Total age of 26 students = 26 × 43 = 1118
Total age including teacher = 27 × 44 = 1188
Teacher age = 1188 − 1118 = 70 years