Respuesta:
conejos = 20
gallinas 12
Explicación paso a paso:
g = gallinas
c = conejos
g + c = 32
2g + 4 c = 104
------------------------
(-2) g + c = 32
2g + 4 c = 104
---------------------------
- 2g - 2c = - 64
2g + 4c = 104
------------------------
2c = 40
40
c = -------- = 20
2
g + c = 32
g = 32 -c
g = 32 - 20
g = 12