I didn't get this either. Some numbers are 1/25, which seems like 1 in 25 chance = 1/25 = 4% Yet other numbers are 6/1, which is 600%.

In UK gambling conventions, 8/1 means you win £8 on a £1 bet. So 12.5% chance, if the bookie is a non profit.

to get the probability out of a/b calculate (b/(a+b))*100