User contributions
- 23:35, 16 May 2009 (diff | hist) . . (+1) . . 2000 AMC 12 Problems/Problem 20
- 23:32, 16 May 2009 (diff | hist) . . (+5) . . 2000 AMC 12 Problems/Problem 20
- 23:22, 16 May 2009 (diff | hist) . . (-24) . . 2000 AMC 12 Problems/Problem 20 (→Solution 1)
- 23:13, 16 May 2009 (diff | hist) . . (-2) . . 2000 AMC 12 Problems/Problem 20
