Question

A man when asked how many hens and buffaloes he has, he told that his animals have 120 eyes and 180 legs. How many hens and buffaloes does he have?

Answer 1

Let the no of hens be x and no of buffaloes be y
2x+2y=120
x+y=60-(1)
2x+4y=180
x+2y=90-(2)
(2)-(1)=>y=30
(1)=>x=60-30
=30

Answer 2

assuming you don't have any mutated hens or buffaloes with 3 eyes or 4 legs, you can set up a system like this to solve...: