US 2016 Math kangaroo Problems Level 11-12-学生用卷

US2016MathkangarooProblemsLevel11-12-学生用卷学生用卷1、【来源】2016年袋鼠数学竞赛(MathKangaroo)竞赛第1题(US2016MathkangarooProblems,Level11−12,Question#1)ThesumoftheagesofTomandJohnis23,thesumoftheagesofJohnandAlexis24,andthesumoftheagesofTomandAlexis25.Whatistheageoftheoldestperson?（）A.10B.11C.12D.13E.142、【来源】2016年袋鼠数学竞赛(MathKangaroo)竞赛第2题(2016MathKangarooProblem,Level11−12,Question#2)Thesumof110+1100+11000is（）．A.3111B.1111110C.1111000D.31000E.311103、【来源】2016年袋鼠数学竞赛(MathKangaroo)竞赛第3题(US2016MathkangarooProblems,Level11−12,Question#3)Mariawantstobuildabridgeacrossariverandknowsthattheshortestpossiblebridgefromeachpointononeshoreisalwaysofthesamelength.Whichofthesepicturescannotbeapictureofherriver?（）A.