If the day before yesterday was Thursday, today is Saturday. Tomorrow is Sunday. Four days after tomorrow (Sunday) is Sunday + 4 days, which brings us to Thursday. Wait, Thursday + 2 = Saturday (Today). Tomorrow is Sunday. 4 days after Sunday is Thursday. The options don't match my logic perfectly if 'after' means +4. Let's re-read. Today is Saturday. Tomorrow is Sunday. Day 1 after tomorrow = Mon, Day 2 = Tue, Day 3 = Wed, Day 4 = Thu. Option C is Friday. Let me adjust the question slightly. '3 days after tomorrow' = Wednesday. '4 days after tomorrow' = Thursday. I'll correct the option to Thursday.

2000 years have 0 odd days. The next 49 years consist of 12 leap years and 37 ordinary years. Odd days = (12 × 2) + 37 = 24 + 37 = 61. 61 mod 7 = 5 odd days. Add 1 day for Jan 1, 1950. Total = 6 odd days. The 6th day of the week is Saturday.

The year 2012 was a leap year, so February had 29 days. The period from Feb 15, 2012, to Feb 15, 2013, includes this 29th day, encompassing 366 days. 366 days equal 52 weeks and 2 odd days. Wednesday + 2 days = Friday.

A person born on 29th February can only celebrate their exact birthday on leap years. 1900 was a century year not divisible by 400, so it was not a leap year and had no Feb 29th. The next leap year was 1904. Thus, his first proper birthday was 8 years later in 1904.

2004 is a leap year. Since the date is April 14th, it falls after the leap day (February 29th). Moving from an ordinary year date to the same date in a leap year past February adds 2 odd days. Monday + 2 days = Wednesday.

The months of March and November share the same calendar in any year because the number of odd days between March 1st and November 1st is exactly a multiple of 7 (3+2+3+2+3+3+2+3 = 21). Therefore, 5th March and 5th November will fall on the exact same day, which is Friday.

In a leap year, calculating the odd days between these pairs yields multiples of 7. Jan to Mar = 3+1+3 = 7. Feb to Jul = 1+3+2+3+2+3 = 14. Mar to Oct = 3+2+3+2+3+3+2+3 = 21. Thus, January-April-July, February-August, and March-November share identical calendars.

Months share the same calendar if the total number of odd days between their start dates is 0. From Jan to Sept: 3+0+3+2+3+2+3+3+2 = 21. Since 21 is a multiple of 7, it gives 0 odd days. Hence, January and October start on the same day and have the same calendar.

A 30-day month has 4 complete weeks (28 days) plus 2 extra days. The 4 weeks contain 4 Saturdays and 4 Sundays. The two extra days (29th and 30th) will match the 1st and 2nd days of the month, which are Saturday and Sunday. Total = 5 Saturdays + 5 Sundays = 10 weekend days.

Leap years normally occur every 4 years. However, century years (like 1700, 1800, 1900) are not leap years unless divisible by 400. So, from a leap year like 1896, the next leap year is 1904, creating a maximum gap of 8 years.