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Largo = 3x
Ancho = 5x
Perimetro = 140
Perimetro = 2 * Largo + 2 * Ancho
140 = 2 * 3x + 2 * 5x
140 = 6x + 10x
140 = 16x
140/16 = x
8,75 = x
Largo = 3x = 3 * 8,75 = 26,25
Ancho = 5x = 5 * 8,75= 43,75
Respuesta.
El ancho mides 43,75 y el largo mide 26,75
b = ancho
Perímetro = 2a + 2b
140 = 2a + 2b
70 = a + b
70-b = a
5(70-b) = 3b
350 -5b = 3b
350 = 3b + 5b
350 = 8b
43,75 = b = ancho
reemplazo en
70 = a + b
70 = a + 43,75
70 - 43,75 = a
26,25 = a = largo