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A student loses a mark for every wrong answer and scores 2 marks for every correct answer. If he answers all the 60 questions in an exam and scores 39 marks, how many of them were correct ?

A student loses a mark for every wrong answer and scores 2 marks for every correct answer. If he answers all the 60 questions in an exam and scores 39 marks, how many of them were correct ? Correct Answer 33

Let,   number of correct answers = P,   number of wrong answers = 60-PAccording to question,                                             2P-(60-P)*1 = 39                                             2P-60+P = 39                                             3P = 99                                             P = 33 (Ans)

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