Odds of 3-5 indicate that your profit will be three-fifths of a dollar. In other words, for every $5 you bet you can win $3 in profit. To determine profit, multiply the amount you bet by the fraction. If I spend $15, then my profit for winning is $9 (15 x 3/5). Ex.
Odds of 7/5 mean you'll win $7 for every $5 you wager on the A's. Conversely, the Rangers' odds of 5/8 mean you need to wager $8 to win $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.