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(30 + 2 x) * x * 2 + 26 * x * 2 = 240
60 x + 4 x^2 + 52 x = 240
4 x^2 + 112 x - 240 = 0
Resolviendo: x = 2 pies
La anchura del camino es 2 ft.
Te adjunto hoja con prcedimiento y representación gráfica.
Saludos