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题目内容双击单词支持查询和收藏哦～
A bookstore sells both new and old books. The unit price of new book is $90, the average price all the old and new books is $60, and the total price of all the old books and all the new books are the same. What is the unit price of old book?
_____dollars
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以上解析由 考满分老师提供。
