The number of the pupils in Garde One is no less ten 100.
问题描述：
The number of the pupils in Garde One is no less ten 100.
If they stand in a line of 2,or a line of 3,or aline of 5,there must be a pupil left every time.But,if they in a lin of 7,there will be a rectangle.Then,the number of the pupils is(
答
意思是：一年级的学生数目少于100个,如果两个人或者3个人或者5个人站成一列,都会多出一个人,如果是7个人,就正好,则学生数目是多少个?
可知是2,3,5的公倍数加1,且正好能被7整除.所以可知是31,61或者91.
可知只有91能被7整除,所以是91