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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 1). 30 years2). 29 years3). 25 years4). 24 years |
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Answer» Given, AVERAGE present age = 33 years ∴ Sum of present ages of 5 member = (Number of members) × (Average present age) = 5 × 33 = 165 years Given, Age of youngest member = 9 years ∴ Sum of the ages of other 4 members just before the birth of youngest member = Sum of present ages of 5 member - Age of youngest member – 4 × 9 = 165 – 9 – 36 = 120 ∴ Average age of other 4 members just before the birth of youngest member = 120/4 = 30 years |
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