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B = x
C = 3x +x → 4x
Planteamos la ecuación:
3x +x +4x = 420000
8x = 420000
x = 420000 / 8
x = 52500
Ahora remplazamos los valores:
A = 3x → 3 (52500) = 157500
B = x = 52500
C = 4x → 4 (52500) = 210000
Respuesta:
A tendrá 157500 pesos, B 52500 pesos y C 210000 pesos.