you have to choose your informations :
s for the numbe of sheep (mouton)
h for the number of horses (cheval)
c for the number of chicken (poulet)
h=2*s
c=3*s
4*h+4*s+2*c = 36 legs (jambes)
if you replace h and c by its value : 8s+4s+6s= 36
you find s=2
and h=4
and c=6
in the farm, there are
2 sheep
4 horses
6 chicken
