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How many working days in year 1958?
Here is the detail of the calculation:
Because 1958 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 10 public holidays that do not fall during a weekend and we obtain 251 working days in 1958.
 Here is the list of these 10 public holidays: 
 
 1. New Year's Day : середа, 1 січень, 1958 
2. Australia Day Observance : понеділок, 27 січень, 1958 
3. Canberra Day : понеділок, 10 березень, 1958 
4. Good Friday : п'ятниця, 4 квітень, 1958 
5. Easter Monday : понеділок, 7 квітень, 1958 
6. Anzac Day : п'ятниця, 25 квітень, 1958 
7. King's Birthday : понеділок, 9 червень, 1958 
8. Labour Day : понеділок, 6 жовтень, 1958 
9. Christmas Day : четвер, 25 грудень, 1958 
10. Boxing Day : п'ятниця, 26 грудень, 1958 
And here are the 3 public holidays falling on a weekend:
1. Australia Day : неділя, 26 січень, 1958 
2. Easter Saturday : субота, 5 квітень, 1958 
3. Easter Sunday : неділя, 6 квітень, 1958