In a competitive exam, 6 marks are awarded for every correct answer and 2marks are deducted for every wrong answer. Arun attempted all questions and scored 70marks .He answered 7questions incorrectly .Find the total number of questions in his exam.
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In a competitive exam, 6 marks are awarded for every correct answer and 2marks are deducted for every wrong answer. Arun attempted all questions and scored 70marks .He answered 7questions incorrectly .Find the total number of questions in his exam.
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Marks given for one correct answer = 5
So, marks given for 10 correct answers
= 5 X 10 = 50
Radhika's score = 30
Marks obtained for incorrect answer
= 30- 50 = -20
Marks given for one incorrect answer
= (-2)
Therefore, number of incorrect answers
= (−20)÷(−2)=10
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