The average age of eight teachers in a school is 40 years. A teacher among them died at the age of 55 years whereas another teacher whose age was 39 years joins them. The average age of the teachers in the school now is (in years)
A) 35 B) 36 C) 38 D) 39
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C. 38
Let mean age=×
x/8=40
x=320.
When 39 joins and 55 dies
New ×=304
then mean=×/8=38
Let mean age=×
x/8=40
x=320.
When 39 joins and 55 dies
New ×=304
then mean=×/8=38
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