Question:

A family consists of the father, mother, son, and daughter. In the year 2015, the son, then aged 25 years, moved away. The average age of the members, excluding the son, in the year 2018 is 24 years. What was the average age of the family in 2012?

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To calculate average age for previous years, subtract the total reduction from the total age for the future years.
Updated On: Sep 30, 2025
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The Correct Option is B

Solution and Explanation

Step 1: Find the total age in 2018.
The average age of the family in 2018 is given as 24 years. Since the family consists of 4 members excluding the son, multiply the average by 4 to find the total age in 2018: \[ 4 \times 24 = 96 \text{ years.} \]
Step 2: Find the total age of the family in 2015.
The son's age in 2015 is 25 years. Subtract his age from the total in 2018 to find the total age in 2015: \[ 96 - 25 = 71 \text{ years.} \]
Step 3: Find the average age in 2012.
The total age in 2012 is 3 years before 2015. Each member's age in 2012 would be 3 years less than in 2015. Therefore, the total age in 2012 is: \[ 71 - 4 \times 3 = 59 \text{ years.} \] The average age in 2012 is: \[ \frac{59}{4} = 18 \text{ years.} \]
Final Answer: \[ \boxed{18 \text{ years.}} \]
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