The present average age of a family of four members is 36 years. If the present age of the youngest member of the family be 12 years, the average age of the family at the birth of the youngest member was
Options:
A . 40 years
B . 48 years
C . 24 years
D . 32 years
Answer: Option D Answer: (d)Sum of the present ages of whole family = 36 × 4 = 144 years Sum of the ages of the family at the birth of youngest member = 144 – 4 × 12 = 96 years ∴ Required Average age =$96/3$ = 32 years
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