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g gallinas
n numero de aves
n = p+g
p/n = 5/12
n= 12p/5
g-p = 18
g = 18 +p
remplazamos los valores en la primera ecuacion
12p/5 = p + 18 +p
12 p /5 = 2p +18
12p = 5 (2p + 18)
12p = 10p + 90
2 p = 90
p= 90/2
p = 45
g = 18 + 45
g= 63
cual es la relacion entre p/(g -13) = 45 /(63 - 13) = 45 / 50
= 9/10 es la respuesta