Problem of the Week

Welcome to the Centenary Math Problem of the Week contest! You can always find the most recent problem of the week below. You can also look at the current scores or read the rules. If you want to stay current with the POTW, you can become a fan of the Centenary Facebook page (at or follow the Centenary POTW twitters (at

Thursday, May 6, 2010

Spring 2010 POTW winners

Congratulations to our Spring 2010 winners: Roland Womack and Charles Madden! They also tied for longest streak of answered questions.

Thursday, April 22, 2010

Spring 2010 Problem 8: Moving an iron chest

The picture below shows an iron chest BCDE. It is three feet by four feet and is resting on a floor with one foot tiles. At A, there is an iron pillar.

The owner of the chest would like to move the chest around the pillar to the outlined position. However, the chest is so heavy, it cannot be pushed or shoved. The only way to move the chest is to lift up one side (so the chest is resting on one leg) and rotate the chest around that leg. What is the least number of turns needed to move the chest (and what are those turns)? (You may ignore the thickness of the pillar at A.)

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Since no one solved this one, I'll keep it around for future semesters to ponder!

Older Problems

Thursday, March 4, 2010
Thursday, February 25, 2010
Thursday, February 11, 2010
Thursday, February 4, 2010
Thursday, January 28, 2010
Thursday, January 21, 2010
Thursday, January 14, 2010
Thursday, November 20, 2008