15. In a class test, 3 marks are awarded for every correct answer and (-2) marks are awarded for every incorrect answer and no mark for not attempting any question.
i) Rita scored 20 marks. If she has got 12 correct answers, how many questions has
she attempted incorrectly?
ii) Savita scored (-5) marks though she has got 7 correct answers. How many questions
has she attempted incorrectly?
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