某单位今年一月份购买5包A4纸、6包B5纸，购买A4纸的钱比B5纸少5元;第一季度该 单位共购买A4纸15包、B5纸12包，共花费510元;那么每包B5纸的价格比A4纸便宜（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25985' and id < 2180990 and id<>'2180990' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25985' and id > 2180990 and id<>'2180990' order by id asc limit 5