There are 180 questions 4marks for every correct answer and -1 marks for incorrect and un-empted questions . if 450 marks he get how many questions did he answer correctly

Answers (1)

Let the no of the correct answer be x than marks he got for a correct answer be 4x.

No of wrong answers and unanswered be (180-x) marks deducted be -1(180-x) now total marks = 450

=> 4x -(180-x) = 450

=> 5x = 450 +180

=> 5x = 630

=> x= 630/5

=> x= 126

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