OG PS-Q289

由 **wisson0927** » 2005-03-16 12:36

In a certain population, there are 3 times as many people aged twenty-one or under as there are people over twenty-one. The ratio of those twenty-one or under the total population is
A 1 to 2
B 1 to 3
C 1 to 4
D 2 to 3
E 3 to 4

ans:E

請問一下，綠色部份應該要如何翻譯呢？

謝謝!!!

由 **agnes** » 2005-03-16 16:50

剛好21歲或小於21的歲的人是大於21歲的人的3倍

由 **homaru** » 2005-03-16 16:52

"小於等於21歲的人數" 是 "大於21歲人數" 的三倍
所以小於等於21歲的人佔全部人口的3/4

由 **agnes** » 2005-03-16 16:53

常用比例語法:
A is three times as many (much) as B : A=3B
There are two times as many (much) A as B : A=2B
There are twice as many males as females : males=2 females
There must be twice as much H as F : H=2F

由 **wisson0927** » 2005-03-16 17:39

謝謝喔....
很詳細!!!

OG PS-Q289

OG PS-Q289

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