The average age of 27 students of a class is 22. If the age of the teacher is also added to their ages, then the average increases by one. Find the age of the teacher.
The average age of 27 students of a class is 22. If the age of the teacher is also added to their ages, then the average increases by one. Find the age of the teacher.
A52
B58
C50
D62
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Correct answer is: 50
Explanation:
Sum of ages of 27 students of a class = 27× 22 = 594
The average age of 27 students of a class and a teacher = 22 + 1 = 23
Sum ofages of 27 students of a class and a teacher = 23 × 28 = 644
Age of the teacher = 644 – 594 = 50
∴ Age of the teacher = 50
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