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How many working days in year 1975?
Here is the detail of the calculation:
Because 1975 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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1975.
 Here is the list of these 9 public holidays: 
 
 1. New Year's Day : Wednesday, 1 January, 1975 
2. Epiphany : Monday, 6 January, 1975 
3. Easter Monday : Monday, 31 March, 1975 
4. Labour Day : Thursday, 1 May, 1975 
5. Corpus Christi : Thursday, 29 May, 1975 
6. Assumption of Mary : Friday, 15 August, 1975 
7. Independence Day : Tuesday, 11 November, 1975 
8. Christmas Day : Thursday, 25 December, 1975 
9. Boxing Day : Friday, 26 December, 1975 
And here are the 4 public holidays falling on a weekend:
1. Easter Sunday : Sunday, 30 March, 1975 
2. Constitution Day : Saturday, 3 May, 1975 
3. Pentecost Sunday : Sunday, 18 May, 1975 
4. All Saints' Day : Saturday, 1 November, 1975