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1. Working days in a 31-day month ●○○○○ 10 ptsA month of 31 days begins on a Friday. The second and fourth Saturdays of the month and every Sunday are holidays. How many working days are there in the month?
2. Months with five Fridays ●●○○○ 20 ptsOne year, January 1 and April 1 were both on a Thursday. How many months in that year have five Fridays? Justify your answer.
3. Maximum months with five Sundays ●●○○○ 20 ptsA month can have at most 5 Sundays. In a year of 12 months, what is the maximum number of months that can have 5 Sundays?
4. Five Sundays in February ●●●○○ 50 ptsApril 16, 2011 was a Saturday. Find all years in the 21st century (2001–2100) in which February has five Sundays.