英語翻譯Finding of a survey of Systems magazine subscribers:Thir

題目：

英語翻譯
Finding of a survey of Systems magazine subscribers:Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five.
Finding of a survey of advertisers in Systems magazine:Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.
placed在這裡是什麼意思?

解答：

找到一雜誌訂戶的系統調查：百分之30的所有商品在響應用戶的廣告放置在該雜誌去年的訂單是在30歲以下的用戶名.
尋找一種在系統雜誌廣告調查：爲響應系統的廣告放置在去年的大部分商品訂單辜負人民在年齡35.
純手打.分給我