There are 12 animals in a farm.Some are CowsThe rest are Chickens.There are 28 animal legs in all.How many Cows are there ?

How many Chickens are there ?

A cow having 4 legs and a chicken having 2 leg.

No. of cows + No. of chickens=12

4(No. of cows) + 2 (No. of chickens) =28

solving these two equation,

No. of cows=2 and No. of chickens=10