If 21st June 2007 was Thursday, then what day of the week was it on 21st June 2011?
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 forward. A year of 365 days has 1 odd day and a year of 366 days has 2. Moving from 21 June 2007 one year at a time:
21 June 2007 to 21 June 2008: 366 days (29 February 2008 falls in between), 2 odd days: Thursday + 2 = Saturday
21 June 2008 to 21 June 2009: 365 days, 1 odd day: Saturday + 1 = Sunday
21 June 2009 to 21 June 2010: 365 days, 1 odd day: Sunday + 1 = Monday
21 June 2010 to 21 June 2011: 365 days, 1 odd day: Monday + 1 = Tuesday