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Mathematics, 15.06.2020 21:57 myhomeacc32
in a test +3 marks are given for every correct answer and -1 for every incorrect answer Mary attempted all questions and scored +20 marks though she got 10 correct answers (1)how many incorrect answers has she attempted? (2)how many questions were given in the test?
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in a test +3 marks are given for every correct answer and -1 for every incorrect answer Mary attempt...
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