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 40 are excluded, the average mark of the remaining will be 90. Find the number of students who wrote the exam.
Options:
A . 20
B . 15
C . 25
D . 35
E . None of these.
Answer: Option C
Let the number of students who wrote the exam be x. Total marks of students = 80 x.Total marks of (x - 5) students = 90(x - 5)80x - (5 * 40) = 90(x - 5)250 = 10x => x = 25
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