solve this plz........
Attachments:
Answers
Answered by
1
let no of right questions be R
wrong question be W
now, 3R-1W=40. (1),
4R-2W=50
2R-W=25. (2),
now substraction 1 and 2 we will get R =15
and W=5
total no of questions is20
wrong question be W
now, 3R-1W=40. (1),
4R-2W=50
2R-W=25. (2),
now substraction 1 and 2 we will get R =15
and W=5
total no of questions is20
Similar questions