In a competitive exam consisting of 100 questions each correct answer gets 2 marks and each wrong answer gets ‐1 mark. If a student has written 70 correct answers and 30 wrong answers what is his or her score
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Answered by
2
Answer:
Let x be the number of correct answers and y be the number of wrong answers.
Since Jayanti answered 120 questions therefore, x+y=120 that is
x=120−y..........(1)
Also, it is given that one mark is awarded for each correct answer while
2
1
mark is deducted for every wrong answer and Jayanti got 90 marks, therefore,
x−0.5y=90..........(2)
Substituting the value of equation 1 in equation 2:
120−y−0.5y=90
−1.5y=−30
y=20
Therefore,
x=120−20=100
Hence, she answered 100 questions correctly.
Answered by
1
Answer:
110. . . . . . . . . is correct
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