In a competitive exam 1mark is awarded for each answer while 1/2 marks is deducted for each wrong answer ramya answer 120 questions and got 90 marks.how many questions did she answered correctly
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No of correct = x
No of wrong = y
x + y = 120 ----------(1)
x - y/2 = 90
2x - y = 180 ---------(2)
Add both,
3x = 300
No. of correct answer = 100
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