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Each copy of a certain textbook in a college bookstore is classified as new or used. The bookstore sells each new copy for $90 and each used copy for another fixed price. For all the copies sold last week, the total revenue from the sales of new copies was equal to the total revenue from the sales of used copies, and the average (arithmetic mean) price per copy was $60. What is the price of each used copy？
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· 相关考点
3.3.3 解多元一次方程组与相关应用题
3.3.3 解多元一次方程组与相关应用题
以上解析由 考满分老师提供。
