If 22^nd January 2011 was a Saturday, then what was the day of the week on 23rd January 2015?

Friday

Using Code Method :-

\(\frac{Date+Month code+Year code+Last 2 digits of yr+Leap yrs till given yr}{7}\)

( Note: Remainder of the above sum will be the code of week day }

22 Jan 2011;

22 + 01 + 06 + 11 + 02 = 42

remainder of \(\frac{42}{7}\) = 0

Therefore, the code of 0 is Saturday

Similarly,

23 Jan 2015;

23 + 01 + 06 + 15 + 03 = 48

remainder of \(\frac{48}{7}\) = 06

Therefore, the code of 06 is Friday