【SAT官方每日一题】7/8/12 Mathematics > Standard Multiple Choice

滚吧肥汤圆UID: 3272378

Read the following SAT test question and then click on a button to select your answer.

2 F; w5 [. ?0 M( w! z" i) MThe population of Norson, the largest city in Transitania,

is  percent of the rest of the population of Transitania. The population of Norson is what percent of the entire population of Transitania?

" U$ h% v" C. L4 B4 a7 `
6 N& m+ v* `& t
! o3 a+ p: p/ W7 z6 [# b* |
A.  

) ^# |* ?1 ~" v  k7 f
' q1 R9 ^3 k' U! iB.  

' C. s, H2 ^1 p" v' s
+ @" O# E- j; X# s* ZC.  

2 ]: p. w+ L. R" ]
D.  

+ j1 W. M. v; g8 S9 d8 A; z
E.  

/ @* Q/ L& S) Z3 k# q3 F
正确答案:D

解析:

Let

equal the population of Norson, and let

equal the entire population of Transitania. Then  is the population of the rest of Transitania.
$ s/ v) r3 [: n, t. E- G; d1 C. E! W+ c
7 H- a" r- N2 `+ A# ]+ \7 F

is

of

, or

.
This gives

,or

.

9 a! m. A3 F, ]8 pSo the population of Norson is one third, or

, of the entire population of Transitania.