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This wall is 3 metres wide, how many 80 cm shelves can I put up on it?
Is this supposed to be an argument for metric? or for imperial? Or just a question?
If it's the first or second one, I don't see the point. If it's the third one, 3 with some extra space.
It was meant to be an example for a fairly common situation where you'd need to convert between cm and m.
Fair enough then.
This wall is 9 feet wide, how many 2'8" shelves can I hang on it?
I cam guarantee you're likely to do the same thing I did, which is just "That's really close to 1m shelves, so it's 3 with gaps."
I grew up with US customary units and I still took a long time to get that compared to metric instantly
I don't know how many 's and "s go in a foot so ¯\(°_o)/¯
And no, I'd go 8 16 24 32, ah, too much, so 3.