Question

plz give me answer fast . I will mark you as brainllist

Answer 1

hey matefull marks = x 
pass marks= y 


.25 of x = y - 30. 
.50 of x = y +20 

solving these equations, x = 200 marks 
y= 80 marks 
y in ters of x in %=80/200 = 40%

Answer 2

let total marks be x.
candidate's marks(y)=0.25*x
the candidate failed by 30 marks so minimum pass marks=0.25x+30

another candidate:
0.5*x=(0.25x+30)-20
solve kr le.