The mean age of 30 students of a class is 10 years. If the age of their teacher is also included then the mean is increased by one year. What is the age of the teacher?

The mean age of 30 students of a class is 10 years. If the age of thei

1.	The mean age of 30 students of a class is 10 years. If the age of their teacher is also included then the mean is increased by one year. What is the age of the teacher?
A.	21 years
B.	22 years
C.	41 years
D.	42 years
E.	None of these
Answer» D. 42 years

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The mean age of 30 students of a class is 10 years. If the age of their teacher is also included then the mean is increased by one year. What is the age of the teacher?

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