math puzzle 21 13 34

What is the answer to this simple math puzzle ? – 6n01m

This puzzle is easy enough for adults and kids too. These puzzles are really not puzzles but you can’t resist that it has a great impact on social media like Facebook and Twitter since it shared by most people and they get hundreds of comments.
21 , 13 => 34
25 , 12 => 37
32 , 51 => 83
04 , 32 => ?
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