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Question 121
In an examination, a student scores 6 marks for every correct answer and loses 4 marks for every wrong answer. If he attempted 80 questions and obtained 310 marks, how many questions did he attempted correctly?
Solution
We can get the equation for marks as,
Marks = 6x - 4y where x= correct answer and y= wrong answer
We have to try for each and individual option.
For 59: 6*59 - 21*4 = 270
For 67: 6*67 - 4*13 = 350
For 65: 6*65 - 4*15 = 330
For 61: 6*61 - 4*19 = 290
For 63: 6*63 - 4*17 = 310
Option C is the answer.
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