(1) Given the total number of heads and feet, find the number of chickens and rabbits:

(total number of feet-number of feet per chicken × total number of heads) ÷ (number of feet per rabbit-number of feet per chicken) = number of rabbits;

Total number of rabbits = number of chickens.

Or (number of feet per rabbit × total head-total feet) ÷ (number of feet per rabbit-number of feet per chicken) = number of chickens;

Total number of heads-number of chickens = number of rabbits