The average age of 30 students in a class is 20 years. If each student's age is increased by 5 years, then determine the number by which the average age is increased.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 5.
If each student's age is increased by 5 years, then the new age of each student will be 5 years more than their original age.
There are 30 students, and each student’s age is increased by 5 years,
The total increase in age for the whole class = 30 × 5 = 150 years
Now,
Increase in average age = 150/30 = 5 years
So, the average age is increased by 5 years