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Three years ago, the average age of a family of 5 members was 17 years. A baby having been born and the average age of the family is the same as three years ago. The present age of the baby (in years) is:
1. 2
2. 1.5
3. 2.4
4. 3

1 Answer

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Best answer
Correct Answer - Option 1 : 2

Given:

3 years ago average age of 5 members is 17 years.

Formula used:

Average = Sum of values/number of values

Calculation:

3 years ago average age of 5 members is 17 years

Sum of ages of 5 members, 3 years ago

⇒ 17 × 5 = 85

Average of Present age of 5 members = 20 years

Sum of present ages of 5 members = 20 × 5 = 100

But a baby born and average remains same i.e 17 years

Sum of present ages of 6 members = 17 × 6 = 102

Age of baby = 102 - 100 = 2 years

∴ The age of baby is 2 years.

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