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The average a...

Question

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

A

36 years

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B

34 years

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C

30 years

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D

28 years

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Solution

The correct option is C 34 years
According to the problem, the teachers age is
$= 16 \times 10 - 19 \times 4 - 5 \times 10$ $
$= 160 - 76 - 50 = 34 y e a r s$

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