the average age of a group of 10 persons was decreased by 3 years when one per

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the average age of a group of 10 persons was decreased by 3 years when one person, whose age was 42 years, was replaced by a new person. find the age of the new person?

Options:

A . 22

B . 24

C . 12

D . 8

Answer: Option C
Explanation :

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