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x= niños
y= adultos
1. x+y=82
2. 12y+6x=762
1. y=82-x
2. 12(82-x)+6x=762
2. 984-12x+6x=762
984-762=12x-6x
222=6x
37=x
Entonces y=82-37
y= 45
Niños=37
Adultos=45