How do you explain this?
A woman lives on the tenth floor of a block of flats. Every morning she takes the lift down to the ground floor and goes to work. In the evening, she gets into the lift, and, if there is someone else in the lift she goes back to her floor directly. Otherwise, she goes to the eighth floor and walks up two flights of stairs to her flat.
The correct logical answer to this question is that a woman is a little person or dwarf. In some flats, the lower numbers are at the bottom, and the higher numbers are at the top. When leaving for work, she is capable of pressing the ground button because it would be at the ground level for her to reach.
When she returns to work, if someone else is in the elevator, though she can't contact "10" for the tenth floor, she can ask the other person to press it for her. However, if she is by herself, she can only reach "8" and must walk the rest of the weight, due to her height.
If a woman lives on the 10th floor and going down, she pushes the ground floor button. And when she comes home she only goes to the 8th floor if the woman is alone on the elevator; however, if someone is with her she goes to the 10th one could assume that she can not reach the button for the 10th floor and would need help for that. Not knowing the set up of the selection panel it would be difficult to say, but this is the only logical explanation.