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How many working days in year 1970?
Here is the detail of the calculation:
Because 1970 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 6 public holidays that do not fall during a weekend and we obtain 255 working days in 1970.
 Here is the list of these 6 public holidays: 
 
 1. New Year's Day : четвер, 1 січень, 1970 
2. National Sovereignty and Children's Day : четвер, 23 квітень, 1970 
3. Labour and Solidarity Day : п'ятниця, 1 травень, 1970 
4. Commemoration of Atatürk, Youth and Sports Day : вівторок, 19 травень, 1970 
5. Republic Day Eve : середа, 28 жовтень, 1970 
6. Republic Day : четвер, 29 жовтень, 1970 
And here is the public holiday falling on a weekend:
1. Victory Day : неділя, 30 серпень, 1970