alleryStart learning →The mean age of 20 boys is 15 years. If their teacher's age is included, the mean rises by 1 year. How old is the teacher?
A38 years
B36 years
C34 years
D32 years
Answer & Solution
Correct answer: B. 36 years
21 people at 16 years give 336 and the boys give 300, so the teacher is 36 years old.
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