• # question_answer The mean age of 29 students of a class is 11 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)  40 years         B)  51 years       C)  41 years    D)  55 years

Correct Answer: C

Solution :

(c): $29\times 11=319;$ Also, $30\times 12=360\text{ }\Rightarrow$teachers age $=360-319-41$

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