By Mansi Yadav

Verified by Ajay Kumar

The average age of a committee of 12 members is 40 years. A member aged 55 years retires and is replaced by a new member aged 31 years. What is the new average age of the committee?

  1. 35 years

  2. 42 years

  3. 38 years

  4. 48 years

Answer: C

Solution

Solution: Original total age \(=12\times40=480\) years. Replacing the 55-year-old with the 31-year-old decreases the total by \(55-31=24\) years. New total \(=480-24=456\). New average \(=456\div12=38\) years. Trick: New average \(=40+\frac{31-55}{12}=38\) years.

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