分类：教育/科学-外语学习
问题：英语题Therearethree5s,three7sandthr 
There are three  5s,three7s and three   ten lines.an you put the nine numbers in the right place to make the three numbers on each of the  ten lines adds up to the same total? 
回答：5  9  7
9  7  5
7  5  9