10. In a test, +3 marks are given foe every correct answer and -2 mark are given for every incorrect answer.
i) Sona scored +15 marks though she got 7 correct answers. How many incorrect answers has she attempted?
ii) Sandra answered 8 correct and 4 incorrectly. What’s her score?
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Answer:
7*15= 105
105-15= 90
90/15=6
8*3=24
4*--2=-8
24-8=16
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