There's a tenant in a condominium, he's an occupant on the 15th floor.. When he is going to work, he uses elevator from 15th floor until Ground Floor, then gets out of the building. After his work and he's going back, he uses elevator from ground floor up to 9th floor, then he uses stairs from 9th floor up to 15th floor.. But when its raining, he's using elevator from 15th floor down until ground floor when he's going to work. And 1st floor up to 15th floor when he goes back from work. Why is that? I'll post the answer later
Bc he's really short and can't reach the button, but when it rains he uses his umbrella to press the button