Mathematics, 28.06.2021 14:00, nauticatyson9

In a mathematics each correct answer gains 5 marks - However, 1 mark is deducted for each incorrect answer. Mary answered 30 questions for a total of 78 marks Determine the number of correct and incorrect questions Mary answered.

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In a mathematics each correct answer gains 5 marks - However, 1 mark is deducted for each incorrect...