US 2016 Math kangaroo Problems Level 9-10-学生用卷

US2016MathkangarooProblemsLevel9-10-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,Level9−10,Question#1)Theaverageoffournumbersis9.Whatisthefourthnumberifthreeofthenumbersare5,9and12?（）A.6B.8C.9D.10E.362、【来源】2016年袋鼠数学竞赛(MathKangaroo)竞赛第2题(US2016MathkangarooProblems,Level9−10,Question#2)Whichofthefollowingnumbersistheclosesttotheresultof17×0.3×20.16999?（）A.0.01B.0.1C.1D.10E.1003、【来源】2016年袋鼠数学竞赛(MathKangaroo)竞赛第3题(US2016MathkangarooProblems,Level9−10,Question#3)Onatestconsistingof30questions,Ruthhad50%morerightanswersthanshehadwronganswers.Eachanswerwaseitherrightorwrong.HowmanycorrectanswersdidRuthhave,assumingsheansweredallquestions?（）A.10B.12C.15