XX: solve the problem of physics.
There is a body of an average weight of 125 kg and a four-storey 16-storey house under construction.
The elevation to the floor is carried out by marches in 11 steps and the height of one floor is 3 meters
The climb to one floor goes through two marches.

XH: The question of the task:

How much was the body that came to the 12th floor saw that the marches above were not installed, and to get to the 16th floor had to go through another entrance?