The average age of 24 boys and a class teacher of class is equal to 15 years. If class teacher left the class then the average becomes 14 years. Find the age of class teacher.
Answer & explanation
Correct answer: option 2
Avg. age of 24 Boys + 1 Teacher = 15 yrs.
Now, teacher left
Therefore, average of 24 boys = 14 yrs.
Age of teacher = (25 × 15) - (24 × 14) = 375 - 336 = 39 yrs.