【OG20-P290-424题】The only articles of clothing in a certain closet are shirts, dresses, and jackets. The ratio of the number of答案解析-雷哥GMAT

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【OG20-P290-424题】

The only articles of clothing in a certain closet are shirts, dresses, and jackets. The ratio of the number of shirts to the number of dresses to the number of jackets in the closet is 9:4:5, respectively. If there are more than 7 dresses in the closet, what is the total number of articles of clothing in the closet?

(1) The total number of shirts and jackets in the closet is less than 30.

(2) The total number of shirts and dresses in the closet is 26.

A

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
分析A选项
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B

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
分析B选项
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C

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
分析C选项
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D

EACH statement ALONE is sufficient.
分析D选项
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E

Statements (1) and (2) TOGETHER are NOT sufficient.
分析E选项
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当前版本由 Helen 更新于2018-09-21 17:35:12 感谢由 Helen 对此题目的解答所做出的贡献。

题干：s+d+j=(9+4+5)n；d>7→n≥2
条件1：s+j=(9+5)n<30→n<30/14→n=2，充分
条件2：s+d=(9+4)n=26→n=2，充分

题目讨论（7条评论）

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202060bpnl

问题理解错误：如果多7件dress，总的是多少 ？
而是问的：dress多于7件，总的是多少

0 回复 2022-12-02 23:32:12

202060bpnl

total number是在加上7过后

0 0 回复 2022-11-10 14:52:36

223022kbojo

If there are more than 7 dresses in the closet > 没看到。

0 回复 2022-06-29 12:38:06

381383ecbw

为什么d>7，n就>=2啊

0 0 回复 2020-10-11 18:48:05
贾思敏回复381383ecbw

d=4n,4n大于7，那n肯定是大于等于2啊，n是正整数，是每一份比例的字母表达法。懂？

0 0 回复 2021-10-04 15:04:40

188449krlzf

为什么x一定要是正整数，4x是不就好了？

1 回复 2020-03-06 09:07:23

700+是我的幸运数字

出现3个或者多个对比的时候，还是要仔细看清楚对比的是谁和谁

0 回复 2020-02-04 10:24:26

cbc021

由题意：
S:D:J=9:4:5;
D>7;
S、D、J皆为正整数

条件1：
S+J<30
则可结合题意中的条件推知：
总衣物数T>=8/（4/18）=36
且      T<=29/(14/18)=37
又因为各项衣物的数目都必须为正整数，所以T必须能被18整除，故只可能等于36.

条件2：
显然可求唯一确定的T

故D为正确答案

0 回复 2018-02-21 12:58:22