In a test of 50 questions, each correct answer fetches two marks and each wrong answer fetches \...

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In a test of 50 questions, each correct answer fetches two marks and each wrong answer fetches \( -\frac{1}{2} \) marks. A candidate attempted all the questions and scored 40 mark. How many questions did he attempt correctly?
(a) 24
(b) 26
(c) 22
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