Why not 10/3 and 3/2? This has always puzzled me, and I thought you might be the people to ask. Cheers
Good question and the only thing i seem to relate it too is that pre-decimilastion prices over 10/1 years ago were priced up as 100/9(11/1), 100/8(12/1), 100/7(14/1) and so on so forth, assuming more money would be wagered on a horse a little over 3/1 or so as it would appear to have a good chance, punters were probably trying to scrape for any little fraction they could get and therefore bookmakers priced up a horse at 100/30 in line to keeping with the pre-decimilisation showing that if you wager 30 you will win 100. I'm sure there are other theories along the lines it's just used for slang term speak among the bookies as they call 100/30 ''burlington bertie'' and all old school bookies used tic-tac as a way of not communicating to the punters so maybe it just caught on from this origin but i feel the 1st paragraph maybe more logical. Hopefully this helps.
