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  1. Out of 10 teachers of a school, one teacher retires and in place of him a new teacher 25 years old joins. As a result of it average age of the teachers reduces by 3 years. Age of the retired teacher (in years) is :
    1. 55
    2. 60
    3. 58
    4. 56
Correct Option: A

Age of new teacher = 25 years
Joining a new teacher , the average age of the teachers reduces by 3 years.
Total decrease average = 3 × 10
Age of the retired teacher = Age of new teacher + Total decrease average
∴ Age of the retired teacher = (25 + 3 × 10) years = 55 years



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