In a quiz, +2 marks are given for a correct answer, -1 marks for an incorrect answer and 0 marks for not attempting a question. Radhika scored 30 marks. If she got 18 correct answers, how many questions did she attempt incorrectly?
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Step-by-step explanation:
Marks given for one correct answer 2
Marks given for 18 correct answers 2x18=36
Radhika,s score=30
Marks deducted for her incorrect answers = 30-36= -6
Marks given for one incorrect answer= -1
Number of incorrect answers = -6÷ -2 = 3
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