Question

The total of the ages of four persons is 86 years. What was their average age 4 years ago?

• A. 20.5 years
• B. 19.5 years
• C. 17.5 years
• D. 20 years

Answer 1

Answer:

C. 17.5 years

Solution:

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 $= 86-4\times{4}$

⇒ 86 - 16 

⇒ 70

Now, Average age of four persons $=\frac{70}{4}$

⇒ 17.5

Hence, the average age of four persons 4 years ago was 17.5