1. The average age of 6 members of a family is 20 years. If the age of the servant is included, then the average age increase by 25%. What is the age (in years) of the servant?
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By: anil on 05 May 2019 01.47 am
Average age of family of 6 members = 20 years => Total age of the family = $$6 imes20=120$$ years Let the age of servant = $$x$$ years Average age of family including servant = $$20 imesfrac{125}{100}=25$$ years => $$frac{120+x}{7}=25$$ => $$120+x=25 imes7=175$$ => $$x=175-120=55$$ years => Ans - (D)
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