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Q. 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
Explanation by: Vaibhav Shukla
Here , Age of the youngest member = 9 years In a family of 5 members, the average age at present = 33 years. 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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