GWD18-23

爱睡觉的猫 · 发表于 2005-12-10 14:22:00

Q23:

The toll for crossing a certain bridge is $0.75 each crossing. Drivers who frequently use the bridge may instead purchase a sticker each month for $13.00 and then pay only $0.30 each crossing during that month. If a particular driver will cross the bridge twice on each of x days next month and will not cross the bridge on any other day, what is the least value of x for which this driver can save money by using the sticker?

A. 14

B. 15

C. 16

D. 28

E. 29

选B 可偶算出来是14 哪位讲讲算法啊,谢谢拉

hitlzc · 发表于 2005-12-10 15:43:00

不会，同问

爱睡觉的猫 · 发表于 2005-12-10 19:32:00

UP UP

nickforget · 发表于 2005-12-10 19:43:00

1。5x大于13＋0。6x，解这个不等式就是了，x取整

hitlzc · 发表于 2005-12-10 22:46:00

以下是引用nickforget在2005-12-10 19:43:00的发言：
1。5x大于13＋0。6x，解这个不等式就是了，x取整

看了楼上的解释才明白这句话的意思，多谢nickforget！

purchase a sticker each month for $13.00 and then pay only $0.30 each crossing during that month.

scujean · 发表于 2006-6-6 10:37:00

觀念是，[買票的變動+固定成本 ]至少要小於
不買票的變動成本

zt123 · 发表于 2008-8-13 08:29:00

看了这位小友的解释我豁然开朗。敢问小友能帮忙解释一下，或者找到有关Q.24 and Q27 的解释连接么？也是GWD 第18套的数学。 Thanks a million!

Amber789 · 发表于 2009-5-28 08:26:00

STILL DON'T GET IT. Why is 5x here? Thx!

songyang0121 · 发表于 2009-5-28 11:26:00

以下是引用Amber789在2009-5-28 8:26:00的发言：
STILL DON'T GET IT. Why is 5x here? Thx!

是 1.5x 即 0.75*2x

jingle0915 · 发表于 2010-8-17 17:43:00

谢谢。。。

GWD18-23

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