Ivan and his little brother made up a game using coins. They flip the coins towards a cup and receive points for every one that makes it in. Ivan starts with 20 points, and his little brother starts with 16 points. Ivan gets 2 points for every successful shot, and his brother, since he is younger, gets 4 points for each successful shot. Eventually, the brothers will have a tied score in the game. How many points will they both have? How many additional shots will each brother have made?