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X attempts 100 questions and gets 340 marks. If for every correct answer is 4 marks and wrong answer is negative one mark, then the number of questions wrongly answered by Mr. X is:

This question was previously asked in
RRC Group D Previous Paper 15 (Held On: 29 Oct 2018 Shift 2)
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  1. 14
  2. 15
  3. 12
  4. 13

Answer (Detailed Solution Below)

Option 3 : 12
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Detailed Solution

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Let the wrong questions attempt by Mr. X be a then

Right question = (100 – a)

According to the question

⇒ (100 – a) × 4 – a × 1 = 340

⇒ 400 – 4a – a = 340

⇒ 5a = 400 – 340 = 60

⇒ a = 60/5 = 12

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