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How many working days in year 1957?
Here is the detail of the calculation:
Because 1957 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 1957.
 Here is the list of these 10 public holidays: 
 
 1. Anul Nou : Tuesday, 1 January, 1957 
2. A doua zi după Anul Nou : Wednesday, 2 January, 1957 
3. Ziua Unirii Principatelor Române : Thursday, 24 January, 1957 
4. Vinerea Mare : Friday, 19 April, 1957 
5. A doua zi de Paște : Monday, 22 April, 1957 
6. Ziua Muncii : Wednesday, 1 May, 1957 
7. A doua zi de Rusalii : Monday, 10 June, 1957 
8. Adormirea Maicii Domnului : Thursday, 15 August, 1957 
9. Crăciunul : Wednesday, 25 December, 1957 
10. A doua zi de Crăciun : Thursday, 26 December, 1957 
And here are the 5 public holidays falling on a weekend:
1. Paște ortodox : Sunday, 21 April, 1957 
2. Ziua Copilului : Saturday, 1 June, 1957 
3. Rusalii : Sunday, 9 June, 1957 
4. Sfântul Andrei : Saturday, 30 November, 1957 
5. Ziua Națională a României : Sunday, 1 December, 1957