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2a+ 4V = 94
a = 28-v
2*(28-v) + 4v = 94
56 - 2v + 4v = 94
2v = 94-56 = 38
v = 38/2 = 19
a = 28-v = 28-19 = 9
Respuesta:
9 aves
19 vacas