The average age of 6 servants in my farm...

The average age of 6 servants in my farm house is 28yrs A new and young servant replaces an old servant then the new average reduces by 1yr. In the above questions if the age of the replaced servant was 31 years, then the age of the new servant is :

a.25 years

b.35 years

c.24 years

d.none of these

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