Three Men and a Judge

Question: There are three men and a judge. The judge has 5 hats. Three of them are red and two of them are white. The judge says "Close your eyes, I am going to place a hat on each of your heads, who ever can guess what color hat they are wearing can go free." Facts: 1. The three men are standing in a line facing the judge. Where person three can see person two, one and the judge. Person two can see person one and the judge, person one can see the judge. Person three opens his eyes first, then person two, then person one goes last. 2. Each person can hear the others response. 3. The additional 2 hats are not visible 4. Person one guesses correctly. Question: What color hat is person one wearing and how do you know?

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Question: If 4+5=24 7+2=21 9+6=63 6+7=?