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x Representa la cuarta parte del largo, Entonces tenemos...
Ancho = x -5
Largo = 4x
Perimetro = 80m
Ocupado la formula: (Ancho * 2) + (Largo * 2)
2(x - 5) + 2(4x) =80
2x - 10 + 8x = 80
10x = 80 + 10
10x = 90
x = 9
Comprobación. (Sustituimos x)
2(9 - 5) + 2(4(9)) = 80
2(4) + 2(36) = 80
8 + 72 = 80
80 = 80
Entonces las medidas de la figura son:
Ancho: (x - 5) = (9 - 5) = 4 m
Largo: (4x) = (4 * 4) = 36 m
Perimetro = 2(4) + 2(36) = 80
8 + 72 = 80
80 = 80
Dado que 36m (Largo) su cuarta parte es 9m, y 9m menos 5 m es igual a 4m (Ancho)