The mean age of 20 students of a class is 10 years. If the age of their teacher is also included then the mean is increased by one year. The age of teacher is

The mean age of 20 students of a class is 10 years. If the age of thei

1.	The mean age of 20 students of a class is 10 years. If the age of their teacher is also included then the mean is increased by one year. The age of teacher is
A.	21 years
B.	41 years
C.	31 years
D.	None of these
Answer» D. None of these

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The mean age of 20 students of a class is 10 years. If the age of their teacher is also included then the mean is increased by one year. The age of teacher is

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