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Hombre = H
Mujer = M
H + M = 60
0.16(H) + 0.2(M) = 11
M = 60 - H
Usando esta relacion en la ecuacion del total que usan lentes:
0.16(H) + 0.2[ (60 - H)] = 11
0.16H + 0.2(60) - 0.2H = 11
0.16H + 12 -0.2H = 11
0.16H - 0.2H = 11 - 12
-0.04H = -1
H = -1/-0.04
H = 25
H + M = 60
M = 60 - H = 60 - 25
M = 35
Hombres 25 ; Mujeres 35
Comprobacion
16% de Hombres = 0.16 (25) = 4
20% de mujeres = 0.2 (35) = 7
4+ 7 = 11
11 = 11