You will find these and additional problems for the AMC 10 and AMC 12 on AMC's web site:
http://www.unl.edu/amc,
available from the 2004 AMC 10/12 Teacher Manual directory:
(http://www.unl.edu/amc/d-publication/d1-pubarchive /2003-4pub/04tm12/04amc1012tm.html) or from our Problems page archives:
(http://www.unl.edu/amc/a-activities/a7-problems/problem81012archive.html).