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?  Select
A) 11
B) 20
C) 28
D) 17
E) 13
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 )   =&gt; n=20   Answer: 20
<result>B</result>
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?