James lost 2 friends, so he has 20 - 2 = 18 friends left. Then he made 1 friend, James now has 18 + 1 = 19 friends.
This justifies what answer for what question? Q & A: 
user
James has 20 friends. Yesterday at work he got into an argument with 2 of his friends. Now he no longer considers them as friends. On his way back home, he made one more friend. So how many friends does James have left?
19
assistant