Mathematics, 22.06.2020 09:57, madisonenglishp2qkow

In a test +3 marks are given for every correct answer and -1 mark for every incorrect answer. Sona attempted all the questions and scored +20 marks through she got 10 correct answers. How many questions were asked?

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In a test +3 marks are given for every correct answer and -1 mark for every incorrect answer. Sona a...