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machos = 2x
Miguel = 6 . 2x + 4 . x = y
12x + 4x = y
16x = y (ecuación 1)
Bruno = 4 . 2x + 3 . x = y - 180
= 4 . 2x + 3 . x + 180 = y
8x + 3x + 180 = y
11x + 180 = y (ecuación 2)
Igualación
16x = 11x + 180
16x - 11x = 180
5x = 180
x = 180 / 5
x = 36
hembras = 36
machos = 2 . 36 = 72
Respuesta: el golfis macho cuesta 72 soles