If 1 January 2011 was a Saturday, then what day of the week was 31 December 2011?

Explanation

To find the day of the week on 31 December 2011, given that 1 January 2011 was a Saturday, we proceed as follows: Step-by-Step Solution: 1. Calculate the total days in 2011: 2011 was not a leap year, so it has 365 days. 2. Find the remainder when 365 is divided by 7: Dividing 365 by 7 gives a remainder of 1. This means that 31 December 2011 is exactly 1 day after 1 January 2011 in terms of the weekday. 3. Determine the day: Since 1 January 2011 was a Saturday, adding 1 day would make 31 December 2011 a Saturday. Conclusion: The day of the week on 31 December 2011 was Saturday.