Task: Question Answering
Input (English): Problem: 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
Output (English): e