# The average mark of the students of a class in a particular exam is 80.

The average mark of the students of a class in a particular exam is 80. If 5 students whose average mark in that exam is 20 are excluded, the average mark of the remaining will be 92. Find the number of students who wrote the exam.

## Answer/Solution

30

### Steps/Work

Let the number of students who wrote the exam be x.

Total marks of students = 80 x.

Total marks of (x - 5) students = 92(x - 5)

80x - (5 * 20) = 92(x - 5)

360 = 12x => x = 30

ANSWER:C

Total marks of students = 80 x.

Total marks of (x - 5) students = 92(x - 5)

80x - (5 * 20) = 92(x - 5)

360 = 12x => x = 30

ANSWER:C