A) 21 years
B) 41 years
C) 31 years
D) None of these
Correct Answer: C
Solution :
Total age of 20 students\[=10\times 20=200.\] Mean age of 20 students and the teacher = 11 years. i.e., total age of 20 students and the teacher \[=21\times 11=231\]years Hence, age of teacher\[=231-200=31\]yearsYou need to login to perform this action.
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