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botella = X+800
X+X+800=860
2x=860-800
x=60/2
x= 30
tapa= 30
botella =800+30= 830
y= botella
y=x+800
x+y=860
x+x+800=860
2x+800=860
2×=860-800
2x=60
x=60/2
x=30 valor de la tapa
800+30= 830
botella:830 soles
tapa:30 soles
La botella excede en 800 a la tapa.