Correct Answer: Option D

Explanation

Average age of 110 students = 16

∴ Total age = 16 x 10 = 160 years

Age of teachers = x, total number of people now = 11

mean age = 19

Total age of new group = 19 x 11 = 209

Age of teachers = x = (209 - 160) = 49 yrs

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