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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?
Average age of 6 members of a family = 25 years
=> Total age of the 6 members = $$25\times6=150$$ years
Age of youngest member = 15 years
Total age of 5 members at the time of the birth of the youngest member = $$150-(15\times6)=150-90=60$$ years
=> Required average age = $$\frac{60}{5}=12$$ years
=> Ans - (B)
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