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[资料分享] 【SAT官方每日一题】7/29/12 Mathematics > Standard Multiple Choice [复制链接]

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发表于 2012-7-30 23:07:24 |只看该作者 |倒序浏览
Read the following SAT test question and then click on a button to select your answer.
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9 s9 g% u1 p! w2 c. `' x8 ~Every student who studies art in a certain school receives exactly one of the grades A, B, C, or D. If [img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_1.png[/img] of the students receive A’s, [img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_2.png[/img]  receive B’s, [img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_3.png[/img]  receive C’s, and [img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_4.png[/img]  students receive D’s, how many students in the school study art?6 D- G+ X* I6 I( x% m9 B
7 Q1 P1 y1 r& I  n* T) l  U/ T6 ]5 m! J
4 R$ K8 z3 R8 t7 v; r

, x) R( R7 m2 ~5 m
  ?4 }8 D) X: }* P
9 d- q+ ]! z# F# @, R! t8 y/ C4 \A.  30; V+ L+ h1 W, _  I

) E- N, `4 M0 Q) v' u6 [' ~B.  60. M% p! @; }0 x6 |2 P0 [  A

+ ?  V/ I6 \) e" |& [" s1 ~' |C.  100( [+ Q; ?4 L- }3 [, ~$ Z* q
- c6 Y% m4 {$ b, c/ e# c
D. 200
& h( s: K" X, B) l" W7 D7 N! K' y$ d( T/ H0 G3 }& k0 t  N1 E
E.  500% F1 t1 T' |1 k, t
# c3 L- ^) ]. N4 r- x' m
正确答案:D
) q6 ]5 b, h$ H4 h% u0 x8 W2 W' o1 b' i$ s$ O6 ^6 Z
解析:
5 {. c1 |& G& C$ ?! o& p( G* Z0 Q6 m0 X) y! S6 b; g/ M
The students who receive A’s, B’s, and C’s account for [img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_12.png[/img]  of the students, that is, [img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_13.png[/img] . This leaves[img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_14.png[/img]   of the students receiving D’s. You know that [img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_15.png[/img]  students receive D’s, so [img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_16.png[/img]  is [img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_17.png[/img]  of the total. This means that the total number of students is[img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_18.png[/img]  times [img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_19.png[/img] , or[img=]http://sat.collegeboard.org/mathmlgen/content/question/QOTD/2012/20120729_20.png[/img]  .
0 [/ |/ `+ {( z" z, F# S3 q3 ^) v+ c1 g! t  D

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