math
posted by TUHITUHI .
in an examination there are 180 questions , 4 marks is given for each correct answers and 1 marks is subtracted for each wrong answers . if a boy scores 220 marks find the no of correct and wrong answers ???

If there are c correct and w wrong answers,
c+w=180
4cw = 220
c=80
w=100
check: 4*80100=220
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