2015 Junior Kangaroo-教师用卷

2015JuniorKangaroo-教师用卷教师用卷1、【来源】(2015JuniorKangarooQuestion#1)Benlivesinalargehousewithhisfather,mother,sisterandbrotheraswellas2dogs,3cats,4parrotsand5goldfish.Howmanylegsarethereinthehouse?（）A.18B.36C.38D.46E.66【答案】C;【解析】Ben,hisfather,hismother,hissister,hisbrotherandallfouroftheparrotshavetwolegseach,making18legsintotal.Thetwodogsandthethreecatshavefourlegseach,making20legsintotal.Hencethereare38legsinthehouse.2、【来源】(2015JuniorKangarooQuestion#2)Thesumoffiveconsecutiveintegersis2015.Whatisthesmallestoftheseintegers?（）A.401B.403C.405D.407E.409【答案】A;【解析】Letthefiveconsecutiveintegersbe���−2,���−1,���,���+1and���+2.Thesehaveasumof5���.Hence5���=2015andtherefore���=403.Therefore,thesmallestintegeris403−2=401.3、【来源】