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P = 2a + 2b
a = ancho
b = largo
b = 4a + 50
P = 500 m
500 = 2a + 2(4a+50)
500 = 2a + 8a + 100
400 = 10a
a = 40
b = 4(40) + 50
b = 210
por tanto el ancho mide 40 m y el largo mide 210 m