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ENIGMAS DESCUBRA !

P/2=2L=A-2=J+2 = n

==> 2n+n/2+n+2+n-2=90 --> 9/2·n =90 --> n=20 CD's

André tem 22 CD's


FONTE:http://br.answers.yahoo.com/question/index?qid=20090125143055AAn10hs
 
jozé'
 
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