How many working days in year 1951?
Here is the detail of the calculation:
Because 1951 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 1951.
 Here is the list of these 10 public holidays: 
 
 1. New Year's Day : понедельник, 1 январь, 1951 
2. Maundy Thursday : четверг, 22 март, 1951 
3. Good Friday : пятница, 23 март, 1951 
4. Easter Monday : понедельник, 26 март, 1951 
5. Labour Day : вторник, 1 май, 1951 
6. Ascension Day : четверг, 3 май, 1951 
7. Whit Monday : понедельник, 14 май, 1951 
8. Constitution Day : четверг, 17 май, 1951 
9. Christmas Day : вторник, 25 декабрь, 1951 
10. St Stephen's Day : среда, 26 декабрь, 1951 
And here are the 2 public holidays falling on a weekend:
1. Easter Sunday : воскресенье, 25 март, 1951 
2. Pentecost : воскресенье, 13 май, 1951