Igor was both the 15th highest and the 15th lowest in a tennis tournament. How many people were in the tournament?
A：28
B：29
C：30
D：31
E：32

答案：B
思路：正數第十五加上倒數第十五個，應該是30個人，但是正數和倒數的第十五名都是一個人，所以，答案應該是29個人。