Dasha and Tanya live in the same entrance. Dasha lives on the 6th floor. Leaving Dasha's place, Tanya went up instead of down as she needed to. Reaching the top floor, Tanya realized her mistake and went down to her floor. It turned out that Tanya walked one and a half times more than if she had gone down immediately. How many floors are there in the building?
From Dasha to Tanya is no more than 5 floors, so the extra path was no more than two floors, and the path upwards was no more than one. Therefore, Tanya went up exactly one floor.

## Answer

7 floors.