【网络综合-SAT试题】
1.Whichofthefollowingcouldbeavalueofx,inthediagramabove?
A.10
B.20
C.40
D.50
E.anyoftheabove
2.Helpersareneededtoprepareforthefete.Eachhelpercanmakeeither2largecakesor35smallcakesperhour.Thekitchenisavailablefor3hoursand20largecakesand700smallcakesareneeded.Howmanyhelpersarerequired?
A.10
B.15
C.20
D.25
E.30
3.Jo'scollectioncontainsUS,IndianandBritishstamps.IftheratioofUStoIndianstampsis5to2andtheratioofIndiantoBritishstampsis5to1,whatistheratioofUStoBritishstamps?
A.5:1
B.10:5
C.15:2
D.20:2
E.25:2
4.A3by4rectangleisinscribedincircle.Whatisthecircumferenceofthecircle?
A.2.5π
B.3π
C.5π
D.4π
E.10π
5.Twosetsof4consecutivepositiveintegershaveexactlyoneintegerinmon.Thesumoftheintegersinthesetwithgreaternumbersishowmuchgreaterthanthesumoftheintegersintheotherset?
A.4
B.7
C.8
D.12
E.itcannotbedeterminedfromtheinformationgiven.
答案：
1.CorrectAnswer:B
Explanation:
Themarkedangle,ABCmustbemorethan90degreesbecauseitistheexternalangleoftriangleBDC,andmustbeequaltothesumofanglesBDC(90)andDCB.AlsoABCisnotastraightlineandmustbelessthan180.Therefore90<5x<180Theonlyvalueofxwhichsatisfiesthisrelationis20.
2.CorrectAnswer:A
Explanation:
20largecakeswillrequiretheequivalentof10helpersworkingforonehour.700smallcakeswillrequiretheequivalentof20helpersworkingforonehour.Thismeansifonlyonehourwereavailablewewouldneed30helpers.Butsincethreehoursareavailablewecanuse10helpers.
3.CorrectAnswer:E
Explanation:
Indianstampsaremontobothratios.Mul
ltiplybothratiosbyfactorssuch
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