The organizers of an essay competition decide that a winner in the competition gets a prize of Rs 100 and a participant who does not win gets a prize of Rs 25. The total prize money distributed is Rs 3000. Find the number of winners, if the total number of participants is 63.
CH3 CH = C (Br) I
(CH3)2 C = C (Cl) Br
CH3 CH = CCl2
CH2 = C (Br) I