Problem of the Week Spring 2013: Riddles and Brainteasers Problem One Out: January 14, 2013     Due: January 18, 2013 Solution Problem Two Out: January 21, 2013     Due: January 25, 2013 Solution Problem Three Out: January 28, 2013     Due: February 1, 2013 Solution Problem Four Out: February 4, 2013     Due: February 8, 2013 Solution Problem Five Out: February 11, 2013     Due: February 15, 2013 Solution Problem Six Out: February 18, 2013     Due: February 22, 2013 Solution Problem Seven Out: March 11, 2013     Due: March 15, 2013 Solution Problem Eight Out: March 18, 2013     Due: March 22, 2013 Solution Problem Nine Out: April 1, 2013     Due: April 5, 2013 Solution Problem Ten Out: April 8, 2013     Due: April 12, 2013 Solution