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3m = 300 cm
x + y = 300
x = 2y + 60
Reemplazamos "x" en la segunda ecuación
x + y = 300
(2y+60) + y = 300
3y + 60 = 300
3y = 240
y = 80 .......√
Reemplazamos "y"
x = 2y + 60
x = 2(80) + 60
x = 160 + 60
x = 220 .......√
Comprobamos reemplazando "x" ^ "yx
x + y = 300
220 + 80 = 300
300 = 300
Rpta: La medida de los listones son 80 cm y 220 cm