If March 2 is Tuesday, what day should it be after 30 days? How to calculate?

If March 2 is Tuesday, what day should it be after 30 days? How to calculate?

Seven days a week, divide 30 by 7, equal to 4 (weeks), the remaining 2 (days), indicating that after 4 weeks and 2 days, after 4 weeks or Tuesdays, another 2 days is Thursdays, so after 30 days is Thursdays
30 divided by 7 = 4 (weeks). 2 (days)
2 + 2 = 4 (days)
A: it's Thursday

September 1st, 2009 is Tuesday. Can you calculate the day of the week on the 30th of this month

30-1=29=4x7+1
Wednesday

January 1, 2008 is Tuesday, January 1, 2009 is Sunday ()
A. Three B. four C. five D. six

366-1 + 1 = 366 (days), 366 △ 7 = 52 (weeks) Because January 1, 2008 is Tuesday, 2 + 2 = 4, so January 1, 2009 is Thursday

New year's day in 2008 (January 1) is Tuesday, so new year's day in 2009 is Sunday______ ．

2008 is a leap year, with 366 days in the whole year 2 (days) new year's day in 2008 is Tuesday, plus two days is Thursday. That is: New Year's day in 2009 is Thursday