[planetguy]

Or to satisfy both crowds it could have been either, and we could have assumed that the reader is smart enough to be able to know how many square feet there are in a square metre, to within the desired accuracy.

Ten and a bit square feet to the square metre. Know it, use it, love it.

[stephenhuey]

Wow, that seems so obvious now! Never occurred to me before, but I love it.