I was taught imperial at home and metric at school. I mix'n'match as required. My house was build to imperial measurements, so my ceilings are 11ft high and my shed is 18ft long, but the posts holding the verandah up are 50mmx50mm.
I can't buy a new bookshelf 3ft wide any more to fit into the space so I have to settle for one 900mm wide.
Given their history you would have thought the Americans would have dumped the Imperial system on principal.
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