In an examination, a student scores 3 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 120 questions and secures 180 marks, the number of questions he attempts correctly, is:
Pick
A) 45  B) 90  C) 80  D) 75  E) 70
Let the number of correct answers be x.   Number of incorrect answers = (120 â€“ x).   3x â€“ (120 â€“ x) = 180 or 4x = 300 or x = 75   ANSWER:75
<result>D</result>
In an examination, a student scores 3 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 120 questions and secures 180 marks, the number of questions he attempts correctly, is: