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La semana = 7 dias
Lo que gastan en un dia = 10,5 L /7 = 1,5L
Lo que consumen en 30 dias = 1,5L * 30 = 45l
Respuesta.
El 30 dias la familia consume 45 litros
x litros --------------------------30 dias
x=10,5*30 /7=315 /7=45 litros