.Let the maximum marks in the
examination = x.
According to the question
= $\frac{40x}{100}$ - $\frac{30x}{100}$ = 50
= x = $\frac{50\times100}{10}$ = 500
25%more means
4 to 5
5unit=40
4unit=32
Passing marks 32
32%=30%+2%
This 2%= 25
100%=1250
32%=400