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Four years ago, the average age of a family of 6 members was 27 years. A baby having been born the average age of the family is the same today. The present age of the baby (in years) is1). 32). 1.53).4). 2.4 |
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Answer» Given, 4 years ago, average age of 6 members = 27 ∴ Sum of age of 6 members 4 years ago = Average age × Number of member = 27 × 6 = 162 ∴ Sum of present age of 6 members = 162 + 4 × 6 = 162 + 24 = 186 Let, Present age of the baby = x years Given, Average age of the family today = 27 ⇒ Sum of age of 7 members today /7 = 27 ⇒ (186 + x)/7 = 27 ⇒ 186 + x = 189 ⇒ x = 3 years |
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