In a test, 3 marks are given for every correct answer and -1 for every incorrect answer. Sona attempted all the questions and scored 20 marks though she got 10 correct answers. how many questions were given in the test ?
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10 multiply by 3=30. But she got 20. So,for every wrong question -1 .Hence,there are 20 questions
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20 questions is the answer
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