Task: Question Answering
Input (English): Problem: 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 . 
Options: a ) 15 , b ) 25 , c ) 30 , d ) 45 , e ) 55
Output (English): c