SOLUTION: in a examination one marks is awarded for every correct as and 1/4 marks is deducted for every wrong answer a student answer 120 question and got 90 marks how many question did he

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Question 1035721: in a examination one marks is awarded for every correct as and 1/4 marks is deducted for every wrong answer a student answer 120 question and got 90 marks how many question did he answer correctly
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
i will use elimination method
c%2Bi=120 multiply by 1
c-%28i%2F4%29=90 multiply by 4
.
c%2Bi=120
4c-i=360 add equations together
5c=480 divide by 5
c=96
96 correct 24 incorrect (24/4=6)
96 marks minus 6 marks =90 marks