In a family of 5 members, the average age at present is 33 years. The youngest member is 9 years old. The average age of the family just before the birth of the youngest member was
Options:
A . 29 years
B . 30 years
C . 24 years
D . 25 years
Answer: Option B Answer: (b)Sum of the present age of family members = 33 × 5 = 165 years 9 years ago, Sum of their age = 165 – 9 × 5 = 120 years ∴ Required average age = $120/4$ = 30 years
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