Abarn has 11 heads and 36 legs. how many are chicks and how many are pigs

answer is 7 pigs and 4 chicks

pigs' legs =     7 x 4 = 28

chicks' legs =  4 x 2 = 8

28 + 8 = 36 legs

c = amount of chickens

p = amount of pigs

now, let's recall that chicken have two legs, and pigs have four legs, whatever "c" is, the amount of legs for all chicken is 2*c, or 2c.

the amount of legs for pigs is 4*p or 4p.

we know there are 36 legs total, therefore 2c + 4p = 36.

we also know that there are 11 heads, since each only has one head, then c + p = 11.