A-A+
Pencils have the same unit cost regardless of
问题详情
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
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请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：C
解析：铅笔的单价(unitcost)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
