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Before 3 years, the average age of a five member family was 17 years. A baby having been born and the average of family is now 17 years. The present age of the baby is - Mathematics

MCQ

Before 3 years, the average age of a five-member family was 17 years. A baby having been born and the average of a family is now 17 years. The present age of the baby is

Options

  • 3 years

  • 2 years

  • 1 year

  • none of these

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Solution

2 years

Explanation:

Before 3 year ago average age of 5 members = 17

Total age = 17 × 5 = 85

Total present age of 5 members = 85 + 15 = 100

Present Average age of 6 members = 17

Total age = 17 × 6 = 102

Age of child = 102 – 100 = 2 years

Concept: Average and Age
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