in a compitition 3 marks are given for every correct answer and -2 marks are given for every incorrect answer and no marks for not attempting any question . Nalini scores -7 marks in this compitition trough she got 9 correct answers . how many question she attempt incorrectly.
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answer is
Step-by-step explanation:
Nalini gave 9 correct answers means she gain 27 marks for giving correct answers but she gained only 7 marks if we subtract 7 from 27 we get 20 so 20 marks are for 1o incorrect answers .
therefore, she attempt 10 questions incorrectly
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