一道老管书写，求解答~

Eileenl · 发表于 2010-11-24 15:29:33

A total of 30 percent of the geese included in a certain migration study were male. If some of the geese migrated during the study and 20 percent of the migrating geese were male, what was the ratio of the migration rate for the male geese to the migration rate for the female geese?
[Migration rate for geese of a certain sex = (number of geese of that sex migrating) / (total number of geese of that sex)]

A.   1/4
B.   7/12
C.   2/3
D.   7/8
E.   8/7

abc268100 · 发表于 2011-8-16 12:05:36

好人啊

Eileenl · 发表于 2010-11-24 17:30:46

厄。。。。。。谁叫我找到答案了咧，呵呵

yucendaren · 发表于 2010-11-24 17:24:47

哈哈你真可爱

Eileenl · 发表于 2010-11-24 15:52:35

自己答了male先，一个项目里30%是male,其中20%是migrating,问male 与female的migrating比率
20%/30%再除以80%/70% 答案B

一道老管书写，求解答~

所属分类: GMAT考试

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