20100912-GMAT陈婧-逻辑数学课教材---答案

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1、练习1.将以下信息表达为数学式子1-1.Y=X+501-2.A=2/3B1-3.X=2B.1-4.Jackisnow14yearsolderthanBill.Ifin10yearsJackwillbetwiceasoldasBill,howoldwillJackbein5years?A.9B.19C.21D.23E.331-5.D2.C.20%3.B4.185.一样大6.C7.D.8.C9.A.10.B11.一群鹅，用来做移民（Immigration）试验，30%是公的，在移民的鹅中20%是公的，问：公鹅的迁徙率比母鹅的迁徙率是多少？

2、12.50%13.8个14.B15.11216-1.1916-2.3316-3.1417.A18.B519.E20.B21.Note:Thefigureisnotdrawntoscale.Arectangularpictureissurroundedbyaboarder,asshowninthefigureabove.Withouttheboarderthelengthofthepictureistwiceitswidth.Iftheareaoftheboarderis196squareinches,what

3、isthelength,ininches,ofthepicture,excludingtheboarder?A.10B.15C.30D.40E.6022.D23.B24.C5,3*P3,3？25.3*3*3*326.正向解题：C4,3+C4,2*C5,1+C4,1*C5,2逆向思维：C9,3–C5,327.C5,2*C10,228．D29.3/830.P4,431.1.一个人扔飞镖，击中靶心的概率是0.7，这个人连续扔了4次飞镖，其中有2次扔中靶心的概率是多少？32..A33.3/834.A；535.B.0.1236.E.9%37.C

4、arsXandYweretravelingtogetheronastraightroadataconstantspeedof55milesperhourwhencarXstoppedfor5minutes.IfcarYcontinuedtotravelat55milesperhour,howmanyminutesfromthetimethatcarXresumedtravelingdidittakecarXtravelingat60milesperhourtocatchupwithcarY?(Assumethatthetimeforc

5、arXtoslowdownandspeedupwasnegligible.A.5B.30C.45D.55E.6038.IfArtandRitacandoajobin4hourswhenworkingtogetherattheirrespectiveconstantratesandArtcandothejobalonein6hours,inhowmanyhourscanRitadothejobalone?39.IfAcandoajobin20daysandBcandothejobin30days,theyworktogethertodo

6、thisjobandinthisperiod,Astopworkfor2.5daysandBstopworkforxdays,andthejobbefinishedfor14days,whatisx?40.Ifx(2x+1)=0and(x+)(2x-3)=0,thenx=A.-3B.-C.0D.E.5附录一GMAT数学词汇表5integer整数factor因子divisor因子,除数multiple倍数，成倍，乘divisible可被整除的reminder余数quotient商oddintegers奇数evenintegers偶数pr

7、imenumber质数compositenumber合数perfectsquarenumber完全平方数perfectcubenumber完全立方数thegreatestcommondivisor最大公约数theleastcommonmultiple最小公倍数thenthpowerofx：XnthenthrootofX:n√Xsquareroot平方根cuberoot立方根fraction分数，numerator分子denominator分母mixednumber繁分数improperfraction假分数properfraction

8、真分数thousands千位hundreds百位tens十位units=ones个位decimalpoint=point=period小数点tenths十分位hundredths百分位thousandths千分位toth