Thought of The Week 1 - A Man with Elevator

 1For the first week, we will give you one of the best-known thinking problems. Some of them are easy and some got tricky question. Hope someone will give the correct answer. Here it goes like this:

A man lives on a 12th floor of a building. Every single day, he always take the elevator to the 6th floor and then steps the remaining up to his apartment at the 12th floor. Explain why.