Four years ago the average age of a family of four…

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Four years ago, the average age of a family of four persons was 18 years. During this period, a baby was born. Today if the average age of the family is still 18 years, the age of the baby is

  1. A. 1.2 years
  2. B. 2 years
  3. C. 2.5 years
  4. D. 3 years

Answer: Option B

Here is complete explanation of Four years ago the average age of a family of four….

Solution(By ExamCraze Team)

Sum of the ages of 4 members, 4 years ago
= (18 × 4) years
= 72 years
Sum of the ages of 4 members now
= (72 + 4 × 4) years
= 88 years
Sum of the ages of 5 members now
= (18 × 5) years
= 90 years
∴ Age of the baby
= (90 - 88) years
= 2 years

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