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y= hombres
x+y=270 o sea x=270-y
80x+100y = 24800
80 (270-y) + 100y = 24800
21600 - 80 y + 100y = 24800
20y = 24800 - 21600
20y = 3200
y= 3200/20
y=160 (mujeres)
x = 270 - y
x= 270 - 160 = 110 hombres