US 2014 Math kangaroo Problems Level 5-6-学生用卷

US2014MathkangarooProblemsLevel5-6-学生用卷学生用卷1、【来源】2014年袋鼠数学竞赛(MathKangaroo)竞赛第1题(US2014MathkangarooProblems,Level5−6,Question#1)ArnoldspelledthewordKANGAROOwithcardsshowingoneletteratatime.Unfortunately,somecardswererotated.ByturningtheKcardbackby90°twicehecancorrecttheletterK,andbyturningthefirstAcardoncehecancorrectthefirstA(seethefigures).Howmanytimesdoesheneedtorotateby90°foralloftheletterstobecorrect?（）A.4B.5C.6D.7E.82、【来源】2014年袋鼠数学竞赛(MathKangaroo)竞赛第2题(US2014MathkangarooProblems,Level5−6,Question#2)Acakeweights900g.Paulcutsitin4pieces.Thebiggestpieceweighsasmuchasthe3otherpiecesweightogether.Whatistheweightofthebiggestpiece?（）A.250gB.300gC.400gD.450gE.600g3、【来源】2014年袋鼠数学竞赛(MathKangaroo)竞赛第3题(US2014MathkangarooProblems,Level5−6,Question#3)Twolargerings,onegrayandonewhite,arelinkedtogether.Peter,infrontoftherings,seestheringsasinthepicturetotheright.Paulisbehindtherings.Whatdoeshesee?（）