in a test +3 marks are given for every correct answer and -1 marks is given for evry incorrect answer. sona attemp all questions and got 10 answer corect but her tatal secure was only +20.. How many incorrect answers did she give?. How many questions were given in the test
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Step-by-step explanation:
10 correct => 30 marks
but she got 20 marks=> -10 marks for 10 question incorrect
hence total 20 questions are there
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