There is not enough information given in what you have said to find the number of tiles. We need either the area or dimensions of the kitchen to find the information you are looking for.
I just kind of sat here playing with numbers i dont really know a shortcut but the answer is 10 chickens and 15 rabbits 10*2= 20 each chicken has two legs so thats 10 heads 20 legs 15*4=60 each rabbit has four legs so thats 15 heads 60 legs 15+10=25 heads 20+60=60 legs
