甲、乙、丙共有100本课外书。甲的本数 除以乙的本数，丙的本数除以甲的本数，商都是 5,而且余数也都是1。丙有多少本书？

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31553' and id < 2527810 and id<>'2527810' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31553' and id > 2527810 and id<>'2527810' order by id asc limit 5