Twin girls born at 24 weeks weighing less than 500 grams each. How high is the possibility of survival?

You'd be amazed... The majority of 24 week infants now survive, especially if they make it through the first 48 hours of life. That's not to say they may not have significant problems with breathing, feeding, development, vision. You also don't say 24 weeks and how many days . 24 weeks 0 days is worse than 24 weeks 5 days - at that stage of the game, every extra day makes a difference. Continue hope, faith and pray.