单选题
A milliner bought a lot of hats, 
of which were brown. The milliner sold 
of the hats including 
of the brown hats. What fraction of the unsold hats were brown?
of which were brown. The milliner sold of the hats including of the brown hats. What fraction of the unsold hats were brown?
【正确答案】
C
【答案解析】[解析] 根据题意可知，总共还有[*]的帽子未卖出去，其中未卖出的棕色帽子占帽子总数的比例为[*]×[*]，所以未卖出去的帽子中，棕色帽子占的比例为：
[*]
[*]