In a test, +3 marks are given for every correct answer and -1 mark is given for every incorrect answer. Sonal attempted all the questions and scored +20 marks, though she got 10 correct answers. (a) How many incorrect answers has she attempted? (b) How many questions were given in the test?
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Step-by-step explanation:
3×10 - y=20
y=10
therefore no. of incorrect answers is 10.
total no. of questions=x+y=20
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