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Conejos = C
Planteo
P + C = 28 (1)
2P + 4C = 82 (2)
Solución
P + C = 28 (1) //×(-2)
2P + 4C = 82 (2)
-2P - 2C = - 56 (1)
2P +4C = 82 (2)
2C = 26
C = 26/2
C = 13
Reemplazas C en (1)
P + C = 28
P = 28-C
P = 28 - 13
P = 15
¿ cuantos patos y conejos son?
R. Hay 15 patos y 13 Conejos