In a management entrance test, a student score 2 marks for every correct answer and loses 0.5 marks fro every wrong answer.A student attempts all the 100 questions and score 120 marks.The number of question he answered correctly was?

• 68
  
  For every wrong answer, 2.5 marks are lost.
  
  If all 100 questions are answered correctly, total marks obtained = 200
  loss in marks =80
  wrong answers = 80/2.5 = 80*10/25 = 32
  correct answers = 100-32= 68
• 12 years agoHelpfull: Yes(5) No(0)
• check
  marks obtained = 68*2 = 32/2 = 136-16 =120
• 12 years agoHelpfull: Yes(1) No(0)
• let ans of x queestion is correct.
  x*2-(100-x)*0.5=120
  2.5x=170
  x=68
  
• 12 years agoHelpfull: Yes(1) No(1)