The average age of 30 students is 9 years. If the age of their teacher is includ

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The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. The age of the teacher (in years) is

Options:

A . 31

B . 27

C . 40

D . 35

Answer: Option C
Answer: (c)Total age of 30 students = 9 × 30 = 270 years Total age of 30 students and a teacher = 31×10 = 310 years∴ Age of the teacher = 310 – 270 = 40 years

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