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How many working days in year 1960?
Here is the detail of the calculation:
Because 1960 is a leap year, it has 366 days.
Let's remove 53 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 254 working days in 1960.
 Here is the list of these 7 public holidays: 
 
 1. Nieuwjaar : Friday, 1 January, 1960 
2. Goede Vrijdag : Friday, 15 April, 1960 
3. Tweede Paasdag : Monday, 18 April, 1960 
4. Bevrijdingsdag : Thursday, 5 May, 1960 
5. Hemelvaartsdag : Thursday, 26 May, 1960 
6. Tweede Pinksterdag : Monday, 6 June, 1960 
7. Tweede Kerstdag : Monday, 26 December, 1960 
And here are the 4 public holidays falling on a weekend:
1. Eerste Paasdag : Sunday, 17 April, 1960 
2. Koninginnedag : Saturday, 30 April, 1960 
3. Eerste Pinksterdag : Sunday, 5 June, 1960 
4. Eerste Kerstdag : Sunday, 25 December, 1960