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3x : n° de varones
7x : n° de damas
Solución:
3x + 7x = 40
10x = 40
x = 40/10
x = 4
Ahora remplazas:
n° de varones : 3x = 3(4) = 12
n° de mujeres 7x = 7(4) = 28
RTA: Hay 28 mujeres.