There are 90 multiple choice questions in a test .Assume two marks for every correct answers for every attempted or wrong responses one mark is deducted from the total score.anitha scored 60 marks in the test.find the number of questions did anitha answered correctly

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Answers

2015-11-26T22:31:15+05:30
Let the no. of correct answers be x.
Therefore, no. of incorrect answers = 90 - x
As per question
2 marks are awarded for correct answer and 1 mark is deducted from total score if the answer is incorrect
therefore, 2x - 1 (90 - x) = 60
2x - 90 + x = 60
3x - 90 = 60
3x = 90 + 60
3x = 150
x = 150 รท 3
50

therefore Anitha answered 50 questions.
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