If it was Wednesday on 15 November 2017, what was the day on 26 January 2016?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Tuesday
The weekday repeats every 7 days, so only the odd days (the days left over after whole weeks) move it. Counting the odd days from 26 January 2016 to 15 November 2017 tells how far 15 November 2017 is ahead of 26 January 2016.
26 January 2016 to 26 January 2017 (one year):
366 days, because 29 February 2016 falls in between
Odd days: 2
26 January 2017 to 15 November 2017 (month by month):
January (27 to 31): 5 days, 5 odd days
February: 28 days, 0; March: 31 days, 3; April: 30 days, 2; May: 31 days, 3
June: 30 days, 2; July: 31 days, 3; August: 31 days, 3; September: 30 days, 2; October: 31 days, 3
November (1 to 15): 15 days, 1
Total: \(5+0+3+2+3+2+3+3+2+3+1=27\), which is 3 weeks and 6 odd days
The day:
Odd days in all: \(2+6=8\), that is, 1 week and 1 odd day
So 15 November 2017 is 1 day ahead of 26 January 2016
26 January 2016 was one day before Wednesday: Tuesday