x+y=77
4x+2y=274
-2x-2y=-154
2x=120
x=120/2
x=60
60+y=77
y=77-60
y=17
RESPUESTA: Hay 60 ovejas y 17 gallinas
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x+y=77
4x+2y=274
-2x-2y=-154
4x+2y=274
2x=120
x=120/2
x=60
60+y=77
y=77-60
y=17
RESPUESTA: Hay 60 ovejas y 17 gallinas