Adding 4 numbers find the missing numbers

3  +   2  +   0  +   _________ = 19

2  +   2  +   0  +   _________ = 15

8  +   4  +   4  +   _________ = 20

3  +   0  +   4  +   _________ = 10

2  +   0  +   4  +   _________ = 14

3  +   3  +   0  +   _________ = 18

1  +   2  +   1  +   _________ = 11

1  +   1  +   2  +   _________ = 17

4  +   2  +   1  +   _________ = 19

6  +   1  +   4  +   _________ = 16

5  +   3  +   2  +   _________ = 20