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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. $ I. ?& i$ q' P

6 |) G. ?. B* k1 c% I1 @2 rEvery 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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. ?( v/ v) P% g" ]6 qA.  30
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B.  603 ~* O1 _9 N% ~( p/ ]8 f1 T& I

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D. 200 9 A, o- R" b7 ?

+ `. N' Y7 |9 f4 n- @6 L& e+ dE.  500$ u; A5 @  p$ O( g

. p; i& b. u& s: q7 ]正确答案:D. c$ s; c- v% r) `: B

7 M8 x/ h4 Q9 }6 }4 f' @解析:8 H( L4 ^& b% l9 y
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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]  . 7 o% m6 o7 {( ?/ x

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