The average age of a family of 9 members is 20 years. If the age of th

1.	The average age of a family of 9 members is 20 years. If the age of the youngest son of the family is 8 years, then the average age of the members of the family just before the birth of the youngest son was approximately.1. 15 years2. 11.5 years3. 12 years4. 13.5 years5. 13 years
Answer» Correct Answer - Option 4 : 13.5 years Given: The average age of a family of 9 members is 20 years. The age of the youngest son of the family is 8 years. Calculation: According to the question, Sum of present ages of 9members ⇒ 20× 9 ⇒ 180 years Total age of a members 8 years ago ⇒ 180– (9× 8) ⇒ 108 years The average age of the members of the family just before the birth ⇒ 108/8 ⇒ 13.5 years ∴ The average age of the members of the family just before the birth of the youngest son was 13.5 years.

The average age of a family of 9 members is 20 years. If the age of the youngest son of the family is 8 years, then the average age of the members of the family just before the birth of the youngest son was approximately.1. 15 years2. 11.5 years3. 12 years4. 13.5 years5. 13 years

Answer» Correct Answer - Option 4 : 13.5 years

Given:

The average age of a family of 9 members is 20 years.

The age of the youngest son of the family is 8 years.

Calculation:

According to the question,

Sum of present ages of 9members

⇒ 20× 9

⇒ 180 years

Total age of a members 8 years ago

⇒ 180– (9× 8)

⇒ 108 years

The average age of the members of the family just before the birth

⇒ 108/8

⇒ 13.5 years

∴ The average age of the members of the family just before the birth of the youngest son was 13.5 years.

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