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Tomás = a
Susana = El doble de "a" -- > 2a
La suma de ambas cantidades es igual a 70: 2a + a = 70
3a = 70
a = 23.3
Reemplazamos:
Tomás = a --> Tomás = 23.3 (3cs)
Susana = 2a --> Susana = 2 ( 23.3) --> Susana = 46.7 (3cs)
3cs= 3 Cifras Significativas.