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In a village the average age of n people is 42 years. But after the verification it was found that the age of a person had been considered 20 years less than the actual age, so the new average, after the correction,increased by 1. The value of n is :

Correct Answer: 20

Explanation:

It is the same as a person with 20 years more age  replaces an existing person of the group ( or village)


Since the total age of the village having n persons, is being increased by 20 years and the average age of village is being increased by 1 year, hence there are total 20 people in the village.


 


Alternatively :  ( n x 42 ) + 20 = ( n x 43 )


                          => n=20


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