The average age of 6 members of a family is 25 years. If the youngest member is 4 years old, then what was the average age of family just before the birth of the youngest member?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 25.2 years.
Given that,
The average age of 6 members of a family is 25 years
The sum of ages of 6 members = 25 × 6 = 150 years
If the youngest member is 4 years old,
According to the question
The total age of the family just before the birth of the youngest member = (150 - 4 × 6) = (150 - 24) = 126 years
Hence,
The average age of the family just before the birth of the youngest member = 126/5 = 25.2 years