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1、华数教育提升思维水平，超越自我2012AMC12BProblemsProblem1Eachthird-gradeclassroomatPearlCreekElementaryhas18studentsand2petrabbits.Howmanymorestudentsthanrabbitsarethereinall4ofthethird-gradeclassrooms?SolutionProblem2Acircleofradius5isinscribedinarectangleasshown.Therat
2、ioofthelengthoftherectangletoitswidthis2:1.Whatistheareaoftherectangle?SolutionProblem3Forascienceproject,Sammyobservedachipmunkandsquirrelstashingacornsinholes.Thechipmunkhid3acornsineachoftheholesitdug.Thesquirrelhid4acornsineachoftheholesitdug.Theyeach
3、hidthesamenumberofacorns,althoughthesquirrelneeded4fewerholes.Howmanyacornsdidthechipmunkhide?SolutionProblem4Supposethattheeuroisworth1.30dollars.IfDianahas500dollarsandEtiennehas400euros,bywhatpercentisthevalueofEtienne'smoneygreaterthatthevalueofDiana'
4、smoney?SolutionProblem5Twointegershaveasumof26.whentwomoreintegersareaddedtothefirsttwo,thesumis41.Finally,whentwomoreintegersareaddedtothesumoftheprevious4integers,thesumis57.Whatistheminimumnumberofevenintegersamongthe6integers?详细答案致电13524602295华数教育提升思维
5、水平，超越自我SolutionProblem6Inordertoestimatethevalueofwhereandarerealnumberswith,Xiaoliroundedupbyasmallamount,roundeddownbythesameamount,andthensubtractedherroundedvalues.Whichofthefollowingstatementsisnecessarilycorrect?SolutionProblem7Smalllightsarehungona
6、string6inchesapartintheorderred,red,green,green,green,red,red,green,green,green,andsooncontinuingthispatternof2redlightsfollowedby3greenlights.Howmanyfeetseparatethe3rdredlightandthe21stredlight?Note:1footisequalto12inches.SolutionProblem8Adessertchefprep
7、aresthedessertforeverydayofaweekstartingwithSunday.Thedesserteachdayiseithercake,pie,icecream,orpudding.Thesamedessertmaynotbeservedtwodaysinarow.TheremustbecakeonFridaybecauseofabirthday.Howmanydifferentdessertmenusfortheweekarepossible?SolutionProblem9I
8、ttakesClea60secondstowalkdownanescalatorwhenitisnotmoving,and24secondswhenitismoving.HowsecondswouldittakeCleatoridetheescalatordownwhensheisnotwalking?Solution详细答案致电13524602295华数教育提升思维水平，超越自我Problem10Whatistheareao
