英语翻译
1.What number can replace the question mark?
2.Trousers on sale for 1/2 off have a green tag.Trousers on sale foe 1/4 off have a yellow tag.Stephen bought two green-tagged trousers originally priced at ￡10each,and one yellow-taggedtrousers originally priced at ￡16.How much did he pay for his trousers?
3.Why is a room full of married people empty?