The average mark of the students of a class in a particular exam is 80. If 8 students whose average mark in that exam is 20 are excluded, the average mark of the remaining will be 90. Find the number of students who wrote the exam.	Options:
A) 15  B) 25  C) 35  D) 45  E) 56
Let the number of students who wrote the exam be x.   Total marks of students = 80 x.   Total marks of (x - 8) students = 90(x - 8)   80x - (8 * 20) = 90(x - 8)   560 = 10x =&gt; x = 56   ANSW56R:56
<result>E</result>
The average mark of the students of a class in a particular exam is 80. If 8 students whose average mark in that exam is 20 are excluded, the average mark of the remaining will be 90. Find the number of students who wrote the exam.