in a class test +5 marks are given for every correct answer and (-2) for every wrong answer. reshma answered all the questions and scored 30 marks though she got 10 correct answers. how many questions has she attempted incorrectly?
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10 correct answer=50
90 incorrect answers= 90*-2=-180
180-50=130 marks
question attempt incorrect=-180÷50=-65
90 incorrect answers= 90*-2=-180
180-50=130 marks
question attempt incorrect=-180÷50=-65
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