Question

If it was Saturday on 15th September, 2012, then what was the day on 15th September, 2005?

Q: Answer-If it was Saturday on 15th September, 2012, then what was the day on 15th September, 2005?

There are 2 odd days in a leap year and 1 odd day in non leap year. There are 2 leap years 2008 and 2012 between 2005 and 2012 The remaining 5 years are non leap years. Thus total odd days 2 X 2 5 X 1 4 5 9 So, there are 2 odd days. As, we are counting in backward so, the days would have to be taken in backwards from Saturday. Thus, on 15 th September 2005, it was Thursday.