Question
A student gets +3 marks for each right answer and - 0.5
mark for each wrong answer in an exam, which consists 250 question. If the student gets 477 exam marks, find the number of wrong questions attempted by him?Solution
Let all the right answer be 250 and also the wrong answer be 250. 
Right answer : wrong answer = 86 : 39 ∴ Number of wrong questions attempted = 39/(86+39)  × 250 = 78
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