Tuesday
Today is Monday, May 19, 2014. If you subtract 27 weeks from today's date, or 189 days, the date would be Monday, November 11, 2013.
Friday. The day before yesterday (WED) was two days after Monday.
7 or 14 or 21 or 28 days ago was also Wednesday 29 = Tuesday 30 = Monday
Wenasday
-1 Monday -2 Sunday -3 Saturday -4 Friday
As today is November 21, the date 46 days ago would have been October 6.
As today is January 11, 40 weeks and 4 days ago would have been April 2.
To find the date 12 weeks ago from today, you would subtract 84 days (since there are 7 days in a week) from today's date. If today is October 3, 2023, then 12 weeks ago would be July 11, 2023.
To find the date 80 weeks ago from today, you would subtract 560 days (since 80 weeks x 7 days/week = 560 days) from today's date. If today is October 23, 2023, then 80 weeks ago would be June 10, 2022.
To find the date 45 weeks ago from today, you would subtract 315 days (since 45 weeks equals 315 days) from today's date. If today is October 6, 2023, then 45 weeks ago would be January 27, 2023.
To find the date 17 weeks ago from today, you would subtract 119 days (since 17 weeks = 17 x 7 days) from today's date. If today is October 24, 2023, then 17 weeks ago would be June 27, 2023.
There are 7 days in a week. If you divide 492 by 7, there is a remainder of 2. You can then use the 2 to go back 2 days, so the answer is Monday.