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competitiveexamination,5 marks are awarded for each correctr In aanswer, while 2 marks are deducted for each wrong answer. Jayantanswered 120 questions and got 348 marks. How many questions didhe answer correctly? |
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Answer» Let us suppose the no. of correct answers is x and wrong answers be yThen -x + y = 120and5x - 2y = 348 according to the given two conditions solving eq. 1x = 120 - yputting this value in eq. 25 (120-y) - 2y = 348600 - 5y -2y = 348-7y = 348 -600 = -252y = -252 / -7 = 36so, x = 120 - 36 = 84so, he answered 84 correct and 36 wrong answers. |
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