in competaive exam 1 marks is correct answer and half marks is reduced for wrong answer . jay answer 120 questions and got 90 marks how many right and how many questions are wrong
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Answer:
right answers = 100
wrong answers = 20
Step-by-step explanation:
let right answers = x
total questions answered = 120
so wrong answers = 120-x
given,
total score = 90
=> x×1 - (120-x)×0.5 = 90
=> x - 60 + 0.5x = 90
=> 1.5x = 90+60 = 150
=> x = 150/1.5 = 100
=> 120-x = 120-100 = 20
right answers = x = 100
wrong answers = 120-x = 20
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