in a class test of 20 questions, 5 marks are given for every given correct answer, -3 marks are given for every wrong answer and no marks are given for questions that are not attempted. Simran scores -3 mark. If she answered 3 questions correctly, how many did she get wrong? How many did she not attempt?
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Answer:
she answered correctly=3*5=15
difference=15--3=15+3=18
no. of wrong answers =18/3=6