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In a class test (+ 3) marks are given for every correct answer and (–2) marks aregiven 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 questionshas she attempted incorrectly? (ii) Mohini scores –5 marks in this test, though she hasgot 7 correct answers. How many questions has she attempted incorrectly?(iii) Rakesh scores 18 marks by attempting 16 questions. How many questions hashe attempted correctly and how many has he attempted incorrectly? |
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Answer» Answer: 12*3=36 36-20=16 16/2=8 Radhika answered 8questions wrong 7*3=21 -5-21=-26 26/2=13 Mohini answered 13 questions wrong x+y=16 3x-2y=18 3x-2y=182x+2y=32(SIMULTANEOUS equations)5x=50 x=10 on PUTTING the value of x in eq 1 10+y=16 y=6 Rakesh answered 10questions correctly and 6 questions wrongly plz mark as brainlist HOPE ITZ HELPFUL TO YOUFOLLOW ME ON INSTAGRAMeshwar_2005_ |
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