If it was Friday on May 15 , 2009, which day was it on March 15 , 2005 ?

Monday Saturday    Friday Sunday

Sunday

Total number of odd days between the years 2005 and 2009 = (2009 - 2005) + 1 = 5 odd days. The year 2008 is a leap year, it has two odd days. So, one extra odd day is added. So, if it was Friday on May 15, 2009, it would be (Friday - 5) Sunday on May 15 , 2005 .