问一道Prep 的输血

serenashu · 发表于 2010-9-6 18:09:18

1、on a certain sight-seeing tour, the ratio of the number of women to the number of children was 5 to 2, what was the number of men on the sight-seeing tour?

(1) on the sight-seeing tour, the ratio of the number of children to the number of men on the tour was 5to 11.

(2)The number of women on the sight-seeing tour was less than 30.

PREP 给的答案是C，但是我觉这道题算不出来啊，第二个条件只给了women less than 30，没有具体数值啊？所以men的number算不出来啊……

G_will · 发表于 2010-9-6 18:10:57

整数。

serenashu · 发表于 2010-9-6 18:20:38

可是算出来不是只有一个范围而已吗?

小橘子 · 发表于 2010-9-6 18:31:17

答案是 C 否？

小橘子 · 发表于 2010-9-6 18:34:00

WOMAN : CHILDREN = 5:2
CHILDREN : MEN = 5 : 11

SO WOMAN : CHILDREN :MEN = 25 : 10 : 55

WOMAN IS LESS THAN 30,SO THE ONLY CHOICE IS 25
THEN MEN IS 55

(1) AND (2) TOGETHER CAN GET THE ANSWER

serenashu · 发表于 2010-9-6 18:52:41

谢谢楼上，好清晰啊~~

gesteven · 发表于 2011-1-10 09:34:34

Oh, this makes sence. No wonder I can't figure it out...

Shine61 · 发表于 2011-3-1 22:27:10

WOMAN : CHILDREN = 5:2
CHILDREN : MEN = 5 : 11

SO WOMAN : CHILDREN :MEN = 25 : 10 : 55

WOMAN IS LESS THAN 30,SO THE ONLY CHOICE IS 25
THEN MEN IS 55

(1) AND (2) TOGETHER CAN GET THE ANSWER

-- by 会员小橘子 (2010/9/6 18:34:00)

漂亮

ttc12345 · 发表于 2011-3-2 01:23:48

W：C是5:2 假设 W25人 C10人
（1）C：M 为5:11假设 C为10人则M为22人
那么就是W:C：M 25:10:22
（2）W小于等于30
这样才能选C啊.....

问一道Prep 的输血

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