Question
Download Solution PDFThe average age of 40 students of a class is 12 years. If the age of the teacher is also included, the average age of the whole group becomes 13 years. The age (in years) of the teacher is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Average age of 40 students = 12 years
Average age of the group (students + teacher) = 13 years
Total number of people in the group = 41
Formula used:
Total age = Average age × Number of people
Calculation:
Total age of 40 students = 12 × 40 = 480
Total age of group (students + teacher) = 13 × 41 = 533
Age of teacher = Total age of group - Total age of 40 students
⇒ Age of teacher = 533 - 480 = 53
∴ The correct answer is option (3).
Last updated on Jul 8, 2025
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