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Lado menor = 2x
Lado mayor = 5x
Perimetro = 2 * Lado mayor + 2 * Lado menor
140 = 2 * 5x + 2 * 2x
140 = 10x + 4x
140 = 14x
140/14 = x
10 = x
Lado menor = 2x = 2 * 10 = 20
Lado menor = 5x = 5 * 10 = 50
Area = Lado mayor por Lado menor
Area = 20 * 50
Area = 1000
Respuesta.
El area es de 1000 Las unidades se las colocas segun te la hallan dado en el problema