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1. A student loses I mark for every wrong answer and scores 2 marks for every correct answer . If he answers all the 60 questions in an exam and scores 39 marks , how many of them were correct?
- A. 27
- B. 27
- C. 27
- D. 27
Answer: Option C
Explanation:
ধরি, সঠিক উত্তর দেওয়ার প্রশ্ন সংখ্যা x
⸫ 2x – (60 – x) × 1 = 39
⇒ 2x – 60 + x = 39
⇒ 3x = 99
⸫ x = 33
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