how many 后面怎么回答

　　How many people were there at the concert?

　　音乐会上有多少人？

　　How many people does the company employ?

　　这个公司雇用了多少人？

　　How many students have been entered for the exam?

　　有多少学生报名参加考试？

　　How many driving lessons have you had so far?

　　你到目前为止上过多少节驾驶课了？

　　How many stairs are there up to the second floor?

　　上到第三层一共有多少磴楼梯？