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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. 5 t3 y/ B! M+ I: L( k$ M

+ r/ B5 R2 V$ k, j9 G  qEvery 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?
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, b4 T& I) _( E/ K- ?2 @4 O  mA.  304 \, `! Z, L$ Q

- N  F  m# M; U% R9 c( DB.  60
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C.  100: o0 h$ {: J. n

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E.  500
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! `" t& s3 w9 T# g9 a; H* k正确答案:D% t1 R1 x0 N; a9 x! V5 P0 V

1 U( b- T$ I* a8 z" ^解析:
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4 U+ Y' Z. S  K1 n1 ]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]  .
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RE: 【SAT官方每日一题】7/29/12 Mathematics > Standard Multiple Choice [修改]
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