Fill in each matrix below with distinct positive integers so that each row has the same sum and each column has the same product. Below is an solved example:

2 20 15
30 3 4

Each puzzle below has a unique solution. All puzzles copyright Erich Friedman, 2008.

4.

1
2 3 4
5.

2
3 6 8
6.

2 9
3 4

7.

4
6
9
8.

3
4
10
9.

5
28
30
10.

3 42

11.

1
8 6
2 4
12.

3
6
4 5
13.

4 7
5
8