In a class of 41 students, average age is 14 years. If a teacher joins the class, the average age increases by 1 year. What is the age of the teacher?
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Teacher is 15years old
kshitij63:
this question is easy
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Average = Total age of all persons/number of person
Average age of 12 students = 14 years
Total age of 12 students =14 × 12 = 168 years ...1)
Now, average age of 12 students and a teacher = 15 years
Total age of 12 students and a teacher =15x (12 + 1) = 195 years ...2)
From (2) - (1)
Age of a teacher = 195 - 168 = 27 years
The age of the teacher is 27 years.
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