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You can find the answer key and solutions here
https://column.sabioacademy.com/2012/11/15/2012-amc-8-solutionsanswers/
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Sabio Column 
can u post the keys?
just A B C D ….
I just did. On this page: https://column.sabioacademy.com/2012/11/15/2012-amc-8-solutionsanswers/
An easier way to
solve #25 is each triangle has an area iof 1/4 and 1/4=1/2AB so AB=1/2
Thank you for sharing your insight.