In a classroom the average age of 39 students was 15 years. If the age of a teacher is added then the average age increased by 3 months. Find age of the teacher.
Answer & explanation
Correct answer: option 1
The average age increased = 3 months
Total age increased by = 40 × 3 = 120 month = 10 years
Teacher age = 15 years + 10 years = 25 years