22 December 2017

• 23:3823:38, 22 December 2017 diff hist −1 2001 AMC 8 Problems/Problem 23 →Solution 2
• 23:3823:38, 22 December 2017 diff hist +11 2001 AMC 8 Problems/Problem 23 →Solution 2
• 23:3723:37, 22 December 2017 diff hist +190 2001 AMC 8 Problems/Problem 23 No edit summary

30 January 2016

• 13:1513:15, 30 January 2016 diff hist +1 m 2006 AMC 10B Problems/Problem 23 →Solution 2 (mass points)

31 December 2015

• 00:0100:01, 31 December 2015 diff hist 0 2007 AMC 10A Problems/Problem 11 →Solution: I changed the 4 in the denominator into a 2, so the solution would actually make sense.