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x+y+z=340
x=3y
z=2y-20
sustituimos x=3y z=2y-20 en la primera ecuacion:
x+y+z=340
3y+y+2y-20=340
6y-20=340
6y=340+20
6y=360
y=360/6
y=60
si y=60
x=3y
x=3(60)
x=180
z=2y-20
z=2(60)-20
z=120-20
z=100
hay 180 de naranja
hay 60 de cola
hay 100 de limon