In a quiz 4 marks for correct answer and-2 for incorrect ones . Rohan answered all the questions and scored 40 marks though he got 15 correct answer how many incorrect answers he had attempted
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Marks for correct answer=4
Marks for incorrect answer=-2
Rohan scored marks in quiz=40
Correct answers =15
He get marks for correct answers=15×4=60
He get marks for incorrect answer=60-40=20
Let incorrect answer be x.
20=60+x(-2)
x(-2)=60-20=40
x(-2)=40
x=40/2
x=20
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