What do all these numbers mean? Each box on the Betfair screen shows the odds (top) and the amount available (bottom) at that moment in time. Prices aren't locked in place, nor is the amount of money available, because bets are being offered and matched all the time.
Odds of 7/5 mean you'll winR$7 for everyR$5 you wager on the A's. Conversely, the Rangers' odds of 5/8 mean you need to wagerR$8 to winR$5 on Texas. Another way to look at it: If the first number is larger than the second, you're betting on the underdog for a higher potential payout.