题目内容：

Can you find a five digit number which when you place a 7 at the
（接上）beginning to make a new number is 4 times larger than when you place the 7 at the end?
求翻译和解题过程

优质解答

原数字是 87912 ,反过来以后就是 21978 ,
计算一下可知 87912=21978*4.

追问：

算了，采纳吧