Asked 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 ???
Answered by Steve
If there are c correct and w wrong answers,

c+w=180
4c-w = 220

c=80
w=100

check: 4*80-100=220