If you are facing a bet of 250 into a pot of 750 you are getting 3:1 odds correct? 750:250 is 3:1. Similar to how 6575:3675 is 1.79:1. Now 3 to 1 odds is 1/(3+1) = 25%. If your pot odds are 25% and your chance of making your hand is 25% then when you put 250 into a 750 pot you will break even in the long run. If you put 250 into the pot 4 times. you will lose 250 3 times and profit 750 (1000-250) 1 time. That means 3:1 is indeed 25% pot odds. Using this same math for your hand 6575:3675 is 1.79 to 1. 1/(1.79 +1) is 35.8%.