建议使用官方纸质指南,查看对照完整题目
【OG20-P280-323题】 A company produces a certain toy in only 2 sizes, small or large, and in only 2 colors, red or green. If,for each size, there are equal numbers of red and green toys in a certain production lot, what fraction of the total number of green toys is large?
1. In the production lot, 400 of the small toys are green.
2. In the production lot, 23 of the toys produced are small.
-
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

一定注意这句:for each size, there are equal numbers of red and green toys.也就是说小绿=小红,大绿=大红
条件一:只知道有400个小绿,NS
条件二:small=2/3,所以large=1/3
所以小绿=(2/3)/2=1/3,大绿=(1/3)/2=1/6
大绿在所有绿toy中所占比例=(1/6)/[(1/3)+(1/6)]=1/3 S 选B
题目讨论 (8条评论)

-
173570snizm
If,for each size, there are equal numbers of red and green toys in a certain production lot,是在说,大号和小号玩具中红绿各半。问绿色大号玩具在所有绿玩具中占比是多少。1只说了小号,不知道大号,不对。2说2/3的是小号,再一半就是小号且绿色,1/3.大号且绿色就是1/6,比例可知
0
0 回复 2022-04-07 12:29:57
-
ziqi
题目翻译是绿玩偶占总数多大算大
0
0 回复 2022-03-19 19:28:10
-
贾思敏
丢,我瞎了,我既没看到for each size, there are equal numbers of red and green toys这一句,也没有看到求fraction
1
0 回复 2021-09-14 22:57:47
-
朋友醒醒
If,for each size, there are equal numbers of red and green toys in a certain production lot,是在说,大号和小号玩具中红绿各半。问绿色大号玩具在所有绿玩具中占比是多少。1只说了小号,不知道大号,不对。2说2/3的是小号,再一半就是小号且绿色,1/3.大号且绿色就是1/6,比例可知
0
0 回复 2021-09-09 16:19:48
-
187569hqa
这个题改名叫:不好好读题的代价之我没看见fraction
5
1 回复 2020-09-21 18:46:54
-
你这只猪
总是会不自觉地把选项1带入到选项二中,这种做法不可取
6
0 回复 2020-06-28 10:20:52
-
emily666
这个题要画图
0
0 回复 2020-03-18 17:22:53
-
kyness
large or small, red=green, 求green large在总数的fraction! 我忽略了fraction这一词! (2)中: 2/3是small === large=1/3 ==== green large= 1/2*1/3 = 1/6
3
0 回复 2019-12-23 17:07:09
-
kyness回复kyness
green large占比green的 1/6÷1/2 = 1/3
1
0 回复 2019-12-23 17:08:17
-