Here's the pdf for the AMC problems and answers for the Septermber 28th math club meeting.

The AMC 12 is a 25 question, 75 minute multiple choice examination in secondary school mathematics containing problems which can be understood and solved with pre-calculus concepts. Calculators are not allowed starting in 2008. For the 2010-2011 school year there will be two dates on which the contest may be taken: Contest 12A on Tuesday, February 8, 2011,and Contest 12B on Wednesday, February 23, 2011.

Purpose
The main purpose of the AMC 12 is to spur interest in mathematics and to develop talent through solving challenging problems in a timed multiple-choice format. What happens before and after the AMC 12 can have lasting educational value. Talents will be enhanced if one practices beforehand, by working through previous examinations, by participating in math leagues and, most importantly, by studying mathematics more intensely than one normally does in high school.

Learning
Although the excitement of testing one's mettle is naturally directed toward the contest itself, it is what happens before and after the contests which can have lasting educational value. Talents are enhanced with practice beforehand. This might be done by working through previous examinations, by participating in math leagues and, most importantly, by studying mathematics more intensely than one normally does in high school. Learning will take place if students singly, jointly and, especially with their teachers, strive to solve those examination problems they did not see how to solve in the allotted time as well as to understand the solutions to those problems that they did not solve correctly. Occasionally, problems are chosen so that certain subtle but significant confusions, as well as some common computational errors, will be identified by the wrong answers listed. These principles and confusions are highlighted in the carefully prepared solutions manual.

Difficulty
Since the AMC 10/12 covers such a broad spectrum of knowledge and ability there is a wide range of scores. The National Honor Roll cut off score for the AMC 12, 100 out of 150 possible points, is typically attained or surpassed by about 5% of all participants. For many students and schools only relative scores are significant, and so lists of top individual and team scores on regional and local levels are compiled. These regional lists and information on score distributions appear in the yearly summary sent to all participating schools. The more valuable comparison students can make is between their own level of achievement and their levels in previous years. In particular, they are encouraged to begin taking the contests early in their mathematics studies and to look back with pride each year on how they have learned to answer questions that they could not have answered previously.

A special purpose of the AMC 12 is to help identify those few students with truly exceptional mathematics talent. Students who are among the very best deserve some indication of how they stand relative to other students in the country and around the world . The AMC 12 is one in a series of examinations (followed in the United States by the American Invitational Examination and the USA Mathematical Olympiad) that culminate in participation in the International Mathematical Olympiad, the most prestigious and difficult secondary mathematics examination in the world.

The AMC 10/12 is not an end in itself. Outstanding performance on it is neither necessary nor sufficient for becoming an outstanding mathematician. The ability to gain insights and do computations quickly is wonderful talent, but many eminent mathematicians are not quick in this way. Also, the multiple-choice format (necessary for the prompt scoring of over 300,000 examinations) benefits those who are shrewd at eliminating wrong answers and guessing, but this is not particularly a mathematical talent. In short, students who do not receive nationally recognized scores should not shrink from pursuing mathematics further, and those who do receive such high scores should not think that they have forever proved their mathematical merit. This contest, and all other mathematical competitions, remains but one means for furthering mathematical development.