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In an examination some questions carry 2 marks each and some others 4 marks each. A student scored 40 marks by attempting 15 questions correct in all. How many questions carrying 2 marks did he attempt correctly? 1. 15 2 12 3. 8 4. 10 |
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Answer» 4. 10 Let x be ques with 2 marks 2x + 4 (15 – x) = 40 2x + 60 – 4x = 40 x = 20/2 = 10 |
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