It drives me crackers that simple division sums flummox people. I'm not blaming anybody here, but it's nearly 900 years since Fibonacci introduced the simple Arabic/ Indian system, but the rule of three doth bother far too many people and that's an indictment of teachers. A perfectly good calculator is a quid in a British pound shop, no idea if you have Euroshops.
A foot is 304.8mm exactly. Five foot three is five and a quarter times that- 1600.2mm Nobody ever laid track accurate to two tenths of a millimetre. That's only twice the level of drink in an English spirit glass, so 1600mm. Seven millimetres to the foot, so 304.8 divided by 7 is... 43.5(42857...) and ignore the small change, 43.5. and 1600 divided by that is.... 36.78(16092...). That's 37mm in anybody's book- the difference in real scale is 3/8 of an inch give or take Trump's IQ.
Far more cogent- what gauge did Fry use? (32mm I bet). And Arigna Town?