In an examination, a student scores 5 marks for every correct answer and loses 2 marks for every wrong answer. If he attempts all 100 questions and secures 290 marks, the number of questions he attempts correctly, is:	Choose the correct choice from the following options
A) 60 B) 80 C) 70 D) 45 E) 50
Let the number of correct answers be x.   Number of incorrect answers = (100 â€“ x).   5x â€“ 2(100 â€“ x) = 290 or 7x = 490 or x = 70.   ANSWER:70
<result>C</result>
In an examination, a student scores 5 marks for every correct answer and loses 2 marks for every wrong answer. If he attempts all 100 questions and secures 290 marks, the number of questions he attempts correctly, is: