If 5 November 2019 was Tuesday, then what was the day of the week on 5 December 2011?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Monday
The weekday repeats every 7 days, so only the odd days (the days left over after whole weeks) shift it. An ordinary year has 1 odd day, and a period containing 29 February has 1 more. Going back from 5 November 2019:
5 November 2011 to 5 November 2019: 8 years, with 29 February 2012 and 2016 inside, so \(8+2=10\) odd days, that is 3 odd days
5 November 2011 was 3 days before Tuesday: Saturday
5 November 2011 to 5 December 2011: the 30 days of November, 2 odd days
5 December 2011 was 2 days after Saturday: Monday