In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If she/he attempts all 60 questions and secures 130 marks, the number of questions she/he attempts wrongly, are?
We are given:
Let x = number of correct answers, y = number of wrong answers.
Since all questions are attempted, x + y = 60.
Total marks = 4·x - 1·y = 130
From x + y = 60 → x = 60 - y
Substitute into total marks equation:
4(60 - y) - y = 130
240 - 4y - y = 130
240 - 5y = 130
5y = 110 → y = 22
The student attempted 22 questions wrongly.
Answer: Option B
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