Can you solve simultaneous equations for four (unknown)variables with the help of three equations? On the basis of incomplete information you can't expect a right (correct ) answer. The two friends may be working equally hard, scoring equal marks, but their social conditions are not same, the student belonging to weaker section must be advanced as long as there is 'ONE AND ONLY ONE SEAT'. If another seat can be created (hypothetically) his friend may get it. In fact parents of both these students should elect a government that ensures All should get opportunity to learn without hurting other's chance. Till then, Reservation is valid....