Correct Answer - Option 3 : 17.5 years
Given:
The total age of four persons is 86 years
Formula Used:
The average age of persons = Sum of ages of Persons/number of persons
Calculation:
According to question,
We have to find the average age of persons 4 years ago
Sum of ages of person 4 years ago = 86 - 4 × 4
⇒ 86 - 16
⇒ 70
Now, Average age of four persons = 70/4
⇒ 17.5
Hence, the average age of four persons 4 years ago was 17.5