Xiaolong went downstairs by the escalator in the shopping mall. He walked down at the speed of one step at a time. As a result, he took 30 steps and went downstairs. Suddenly, he found that he lost hi

Xiaolong went downstairs by the escalator in the shopping mall. He walked down at the speed of one step at a time. As a result, he took 30 steps and went downstairs. Suddenly, he found that he lost his bag in a hurry. When going down, if people take one step, the elevator goes down to the X floor, and there are:

30+30x=90？ 903x，

The solution is x= 1,

So the number of elevators is 30+30=60 (floors).

So the answer is: 60.