In a test, for each correct answer 1 mark is awarded and each wrong answer half a mark is deduct...

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In a test, for each correct answer 1 mark is awarded and each wrong answer half a mark is deducted. The test has 70 questions. A candidate attempted all the questions in the test and scored 40 marks. How many questions did he attempt wrongly?
(a) 15
(b) 20
(c) 25
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