Hang has worked himself into a corner. He raised preflop with K♠ Q♠ and the flop has come J♦ T♣ 5♥. Jeffrey has made a $50 bet into the $100 pot. This however puts Hang all-in, as he has only $30 left. Normally he wouldn't call with the straight draw, but using the Odds Helper he sees he has actually a 31% chance to make the straight by the river. He has in this case an expected value of almost $50 to a $30 bet, thus he makes the call.