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  3. Pencils have the same unit cost regardless of the number sold, x pencils cost a

Pencils have the same unit cost regardless of the number sold, x pencils cost a

游客2024-01-12  54
问题 Pencils have the same unit cost regardless of the number sold, x pencils cost a total of $0.5, and n pencils cost a total of y dollar.

Column A                  Column B
n                         2xy
选项 A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案 C
解析 铅笔的单价(unit cost)与其销售量无关，x支铅笔卖$0.5，n支铅笔卖y美元。
解：本题的正确答案为(C)。单价不变，即0.5/x=y/n ,所以n=2xy
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