A student loses 1 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 33
B 31
C 27
D 37

Correct Answer: 33

ধরি, সঠিক উত্তর দেওয়ার প্রশ্ন সংখ্যা x ⸫ 2x – (60 – x) × 1 = 39 ⇒ 2x – 60 + x = 39 ⇒ 3x = 99 ⸫ x = 33
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