Out of 10 teachers of a school, one teacher retires and a new teacher aged 25 years joins in his place. As a result, the average age of the teachers falls by 3 years. What is the age of the retired teacher?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 55 years
When the average of 10 people falls by 3 years, the total age falls by \(10\times3=30\) years. Only one person has changed, so the newcomer is 30 years younger than the person who left.
Fall in total age \(=10\times3=30\) years
Age of the retired teacher \(=25+30=55\) years