Answer: A
Let the marks scored by P,Q,R and S be a, ak, ak2 and ak3 respectively.
Marks scored by R were 275/9% less than the marks scored by P and Q.
So, if marks scored by P and Q were 36 then those scored by R is 25.
Marks scored by P and Q = a+ak =36
Marks scored by R = ak2 =25
=> (a+ak)/ak2 = 36/25 => k= 5/4.
P =a, Q = 5a/4, R= 25a/16, S = 125a/64
=> P= 64a, Q = 80 a, R = 100a and S = 125a
S scored (125a-80)/80a * 100 more than Q
=> (45/80) * 100 = 56.25%
S scored 56.25% more than Q..