Question

In a multiple choice examination of 20 questions, four marks are given for each correct answers and one mark is deducted for each wrong answer. There is no penalty for not attempting a question. a candidate attempts "a" questions and get "c" correct. Write down, and simplify, an expression for the candidate's total mark in terms of "a" and "c".​

Answer 1

Total Mark = 5c - a

Explanation:

Total Mark = 4c - (a - c) = 5c - a

Marks for correct questions = 4c

Marks deducted for incorrect questions = a - c