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Hombres: X
Mujeres: X
Hoy:
Hombres: X - 4
Mujeres: X - 9
entonces:
1/3 * (X - 9 + X - 3) = X - 9
(X - 9 + X - 3) = 3 * (X - 9)
2X-12 = 3X- 27
3X - 2X = 27 - 12
X = 15
Por tanto el numero de mujeres que asistieron son : X - 9 = 15 - 9 = 6