Discussion

If Mar 18th,1994 falls on Friday then Feb 25th,1995 falls on which day?

Answer: C

Count the days from one date to the other and reduce modulo 7.

From 18 March 1994 to 18 March 1995 is a full ordinary year, 365 days, so

\[ 365 \equiv 1 \pmod 7 \]

Going back from 18 March 1995 to 25 February 1995 is 21 days, which is exactly 3 weeks and so leaves no odd day. Net shift from the given Friday:

\[ +1 - 0 = +1 \quad\Longrightarrow\quad \text{Friday} + 1 = \textbf{Saturday} \]

1995 is not a leap year and February 1995 has 28 days, so no extra day creeps in.

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