SSC GD Constable 4 Feb 2025 Shift 3 Paper

Section: Elementary Mathematics

Question : 55 of 80

Marks: +1, -0

The average age of 54 students of 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:

Validate

Solution:

Average age

=

Total age

\/

Number of members
Calculation:
Total age of 54 students

=54 × 37

Total age of 54 students = 1998
Total age of 55 members (including teacher)

=55 × 38

Total age of 55 members = 2090
Age of the teacher

=

Total age of 55 members - Total age of 54 students
Age of the teacher = 2090-1998
Age of the teacher

=92

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