1．How many square yards of carpet are required to cover a rectangular floor that is 12 feet long and 9 feet wide？（There are 3 feet in a yard.）（　?。?br />要覆蓋一個長12英尺、寬9英尺的矩形地面，需要多少平方碼的地毯？（1碼等于3英尺。）（　?。?/div>

2．Students Arn,Bob,Cyd,Dan,Eve,and Fon are arranged in that order in a circle.They start counting：Arn first,then Bob,and so forth.When the number contains a 7 as a digit（such as 47）or is a multiple of 7 that person leaves the circle and the counting continues.Who is the last one present in the circle？（　?。?br />學生Arn、Bob、Cyd、Dan、Eve和Fon按照這個順序排成一個圈。他們開始數(shù)數(shù)：首先是Arn,然后是Bob,依此類推。當數(shù)字中含有7這個數(shù)字（例如47）或是7的倍數(shù)時，那個人就離開這個圈子，計數(shù)繼續(xù)。誰是圈內的最后一個人？（　?。?/div>

3．Let Z be a 6-digit positive integer,such as 247247，whose first three digits are the same as its last three digits taken in the same order.Which of the following numbers must be a factor of Z？（　?。?br />設Z是一個六位正整數(shù)，例如247247，其前三位數(shù)字與按相同順序取的后三位數(shù)字相同。以下哪個數(shù)字必定是Z的因數(shù)？