On the quilt maths not mathsing, would it be too cynical of me to suggest that they have simply chosen a number, which is at odds with reality?
If it helps, I now put quilt covers on in the prescribed fashion, rather than standing inside the cover. I don't know how my wife does it, I've never seen her do one.
It does happen when I work away, but I dont know the method; for all I know, she may make our daughter do it.