Answer:
There are
chicken and
cows.
Explanation:
Each cow has four legs, while each chicken has two.
Assume that all
animals are cows. Under this assumption, there would be
legs in total.
For each chicken counted as a cow, this calculation would have counted
extra legs.
In total, this calculation counted
extra legs. Since every two extra legs correspond to a chicken, those
extra legs would correspond to
chickens counted as cows.
In other words,
of those
animals are chicken. There would then be
cows among those animals.