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y ===> costo por litro
x*y=700
(x*y) -(80*y)=40
SISTEMA DE ECUACIONES
xy = 700 ====> (*-1) -xy = -700
xy - 80y = 40 ====> xy -80y = 40
-80y = -660
y = 660/80 ===> 8,25
Costo por litro es 8,25
700/8.25 = 84,848484848484845 ====> capacidad en litros del tonel
84,85 litros es la capacidad
COMPROBACION
84,85 * 8,25 ===> 700.0125