1. The average age of 6 members of a family is 25 years. If the youngest member of the family is 15 years old, then what was the average age (in years) of the family at the time of the birth of the youngest member?
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By: anil on 05 May 2019 02.26 am
Average age of 6 members of a family = 25 years => Total age of the 6 members = $$25 imes6=150$$ years Age of youngest member = 15 years Total age of 5 members at the time of the birth of the youngest member = $$150-(15 imes6)=150-90=60$$ years => Required average age = $$frac{60}{5}=12$$ years => Ans - (B)
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