If 14 November 1989 was a Tuesday, then what was the day of the week on 26 April 2013?
Friday
Move from 14 November 1989 to 14 November 2012 (23 years). Leap years in between that add a day: Feb 1992, 1996, 2000, 2004, 2008 and 2012, which is 6.
Odd days = 23 + 6 = 29, and 29 mod 7 = 1, so 14 November 2012 was one day after Tuesday, a Wednesday.
From 14 November 2012 to 26 April 2013: 16 (rest of Nov) + 31 (Dec) + 31 (Jan) + 28 (Feb) + 31 (Mar) + 26 (Apr) = 163 days.
163 = 7 × 23 + 2, giving 2 odd days, so the day is two days after Wednesday.
Hence, the answer is Friday.
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