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hombres= x
x + y = 60
x+ 2x+15= 60
3x+15= 60
3x= 60-15
3x= 45
x= 45/3
x= 15 ← hombres
y= 2x+15
y= 2(15)+15
y= 30+15
y= 45 ←mujeres
comprobación
x+y=60
15+45=60
60=60