In a class test (+ 3) marks are given for every correct answer and (-2) marks are given for every incorrect answer and no marks for not attempting any question. (i) Radhika scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly? (i) Mohini scores-5 marks in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly?
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- sol:- no. of questions she answered correctly = 12. marks she obtained for correct answers = 12 ×3= 36. marks she obtained =20. marks she got because of answers the questions incorrectly= 20-36. = -16. marks given for 1 incorrect answer=(-2) therefore no. of questions she answered incorrectly = (-16)÷(-2)= 8
- marks minimum got is (-5) no. of questions she answered correctly = 7 marks she obtained for 7 correct answers 7×3= 21. marks she obtained for 1 incorrect answer is (-2) hence marks she obtained for incorrect answers = (-5) - 21 =(-26) therefore no. of questions she answered incorrectly = -26 ÷ (-2) = 13
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