Ben has 165 pictures from his summer trip to Austria he puts 6 pictures on each page of a photo album how many pages did Ben fill?
The number of pages filled by Ben can be calculated by dividing the total number of pictures he has by the number of pictures he puts on each page: 165 pictures / 6 pictures per page = <<165/6=27.5>>27.5 pages.
Since we cannot have a fraction of a page, Ben must have filled 27 pages. Answer: \boxed{27}.