There are 180 multiple choice questions in a test

Asked by admin @ in Math viewed by 285 People

there are 180 multiple choice questions in a test . a candidate gets 4 marks for every correct answer and for every an attempted or wrongly answered questions 1 mark is deducted from the total score of correct answers if a candidate scored 450 marks in test how many questions did he answer correctly

Answered by admin @


Let the number of correctly attempted questions be x

so, the number of unattempeted or wrong question = 180-x


total marks for correct attemptions = 4x

and total marks for unattempeted or wrong question = -1 (180-x)
= x - 180

as total marks = sum of attempted and unattempeted or wrong question = 180-x


450 = 4x + x - 180
450 = 5x -180
630 = 5x
126 = x


so, the number of correctly attempted question was 126.


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