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Time, Clock & Calendar Medium 2 min

If January 1 of a non-leap year is a Tuesday, what day of the week is December 31?

Hint
A normal year contains 365 days.

Answer

Tuesday.

Explanation

December 31 is 364 days after January 1. Since 364 is exactly divisible by 7, the weekday is unchanged.

Step-by-Step Solution

365 days = 52 weeks + 1 day.
December 31 is 364 days after January 1.
364 mod 7 = 0.
Therefore Tuesday.
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