I have the premise that a cylinder and track are a 1:1 ratio. But what is confusing is taking a hard drive with 7 platters in use and then asking "how many tracks are on any 2 cylinders of this 7 platter hard drive" Is it 7 or would you double that to 7x2=14?
A track is a section of a cylinder. A drive with one platter and one head on a single surface of that track would have one track per cylinder. A drive with 7 platters would probably have a head on each surface of each , so that would make 14 tracks per cylinder.
So a drive with 7 platters and 14 heads has 28 tracks per two cylinders.
Keep in mind that cylinders aren't really a relevant concept in modern drives, as these drives use logical block addressing (LBA), where each logical sector is addressed by a single number, and the drive's firmware maps that to a physical track on a surface of a platter, but it is not possible to control or predict which surface.