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?
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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