Question

There are 180 multiple choice questions in a test. If a candidate gets 4 marks for every correct answer and for every unattempted or wrongly answered question one mark is deducted from the total score of correct answers. If a candidate scored 450 marks in the test, how many questions did he answer correctly?

Answer 1

Let the number of correct answers are x

Number of wrong answered questions are (180 - x)

Total score due to right answers = 4x

Marks deducted due to wrong answers = 1(180 - x) = 180 - x

According to question:

Therefore number of correct questions are 126