A test has 60 questions. For each correct answer 2 marks are awarded and each wrong answer 1 (W)...

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A test has 60 questions. For each correct answer 2 marks are awarded and each wrong answer 1
(W) mark is deducted. A candidate attempted all the questions in the test and scored 90 marks. Find the number of questions he attempted correctly.
(a) 54
(b) 48
(c) 49
(d) 50
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