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How many working days in year 1905?
Here is the detail of the calculation:
Because 1905 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 251 working days in 1905.
 Here is the list of these 9 public holidays: 
 
 1. Lunes de Carnaval : понеділок, 6 березень, 1905 
2. Martes de Carnaval : вівторок, 7 березень, 1905 
3. Viernes Santo : п'ятниця, 21 квітень, 1905 
4. Día del Trabajo : понеділок, 1 травень, 1905 
5. Batalla de Pichincha : п'ятниця, 26 травень, 1905 
6. Primer Grito de la Independencia : п'ятниця, 11 серпень, 1905 
7. Independencia de Guayaquil : понеділок, 9 жовтень, 1905 
8. Día de los Difuntos : п'ятниця, 3 листопад, 1905 
9. Navidad : понеділок, 25 грудень, 1905 
And here is the public holiday falling on a weekend:
1. Año Nuevo : неділя, 1 січень, 1905