1.

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

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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