The average age of 9 students and their teacher is 16 years. The average age of

Question

The average age of 9 students and their teacher is 16 years. The average age of the first four students is 19 years and that of the last five is 10 years. The teacher’s age is

Options:

A . 34 years

B . 36 years

C . 28 years

D . 30 years

Answer: Option A
Answer: (a)Teacher’s age = 16 × 10 – 19 × 4 – 5 × 10 = 160 – 76 – 50 = 34 years

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