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Y = Numero de Vacas; ($ 70) Pero Y = 2X
70Y + 85X = 2700 (Reemplazo Y = 2X)
70(2X) + 85X = 2700
140X + 85X = 2700
225X = 2700; X = 2700/225 = 12
X = 12 Bueyes
Y = 2(12) = 24 Vacas
70(24) + 85(12) = 1680 + 1020 = 2700
Rta; Compro 24 vacas y 12 Bueyes