Question

In an examination, a candidate scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If the attempts all 100 questions and secures 100 marks, the number of questions he attempts correctly is:

• A. 30
• B. 50
• C. 45
• D. 40

Answer 1

Answer:

D. 40

Let the correct answers = x No of wrong answer = y x+y=100 => (1) 4x-y=100 => (2) (1)+(2), 5x = 200 X = 40.