1. The average age of 5 members of a family is 24 years. If the youngest member is 8 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 01.48 am
The average age of 5 members of a family is 24 years $$Rightarrow$$ total age of 5 members = $$5 imes 24=120$$ age of youngest one = 8 years before the birth of youngest one means before 8 years, their total age = $$120 - 5 imes 8=120-40=80$$ at that time, there would be 4 persons only. hence, average = $$frac{80}{4}=20.$$ so the answer is option B.
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