Average age of 36 students of a group is 14 years. When teacher included, the average increases by 1 year, what is the age of teacher?
Correct Answer: Option C
⇒ Average of 36 students = 14
⇒ 37 member = 14 + 1 = 15
⇒ Age of teacher = {(37 × 15 – 36 × 14)}
= 555 – 504
= 51 years
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