哪些问句答案可以用seven来回答

以下句子都可以回答seven

1、How many students in the classroom(教室里有几个学生)

2、How old are you?(你几岁)

3、What's your number?(你的号码是多少)

4、How much is two and five?(2+5等于多少)

5、What is ten minus three(10-3等于多少)

6、How many books do you have?(你有几本书)