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The total of the ages of four persons is 86 years. What was their average age 4 years ago?
1. 20.5 years
2. 19.5 years
3. 17.5 years
4. 20 years

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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

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