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The average age of 7 people in a family is 24 years, If the age of the youngest member of the family is 3 years, what was the average age of the family at the birth of the youngest member? 
1. 24 years
2. 24.5 years
3. 25 years
4. 25.5 years
5. 27.5 years

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Correct Answer - Option 2 : 24.5 years

Given:

Average age of 7 people = 24 years

Age of youngest member = 3 years

Formula used:

Average = sum of observations/total number of observations

Calculation:

Total age of 7 members = 24 × 7 = 168 years

Total age 3 years ago = 168 - (7 × 3) = 147 years

The number of members at that time was 6

So, average age = 147/6 = 24.5 years

∴ The average age was 24.5 years

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