I'm going to take a moment before my morning sessions and make poker (and the math involved) really easy. In poker, we're usually concerned with finding two numbers and then comparing them. The first number is a risk-to-reward ratio, and the second number is our chance of winning. Different scenarios will have us calculating these two numbers in different ways. I'm going to give a few basic scenarios, let people reply, and then come back with some more questions.

1. A lone Villain bets into you on the river and if you call you'll have a 25% chance to win. Should you call?
2. On the river you're out of position against a lone Villain. If you bet pot and Villain calls, you'll have a 25% chance to win. Should you bet pot?
3. You have a 12-out draw on the flop and a lone Villain shoves the flop. Should you call?