Discussion
The average age of all the 16 professors of L.K. University is 52 years. After four years what will be the average age of all the 16 professorsif there is no retirement or recruitment?
Answer: C
The average age will be 56 years.
With no one leaving or joining, every one of the 16 professors is four years older, so the total age rises by \(16 \times 4 = 64\) years and the average rises by exactly 4 years: \(52 + 4 = 56\).
The size of the group does not matter: when every member ages by the same amount, the average ages by that amount too.
68 years adds 16 (the number of professors) instead of 4, and 58 years adds 6. 'None of these' is wrong because 56 is offered.
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