- A54 years
- B53 years
- C40 years
- D27 years
Step-by-Step Solution
Students' total = . New total with teacher = . Teacher's age = 574 - 520 = 54 years.
Answer: A) 54 years
The mean age of a class of 40 students is 13 years.
When the teacher's age is included, the mean rises to 14 years.
Find the teacher's age.
Class 7Arithmetic MeanData Handling
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Arithmetic Mean practice questions
More Class 7 Arithmetic Mean practice
Suppose 6 numbers have a mean of 8. If 5 is added to the first number, 5 is subtracted…Meena's marks in 4 subjects average 72. To raise her average to 75 over 5 subjects, what…For a list of 20 numbers, the mean is 18. If 4 is added to each of the 20 numbers and…A cricketer has a mean of 40 runs after 10 innings. How many runs must he score in his…In a colony in Nagpur, the mean monthly electricity bill of 25 houses is ₹600. The mean…