Number Sum
The following grid of size 5x5 is partially complete with whole numbers from 1 to 7.
The sum of each row and column is shown on the edges of the grid.
Fill in the missing numbers to complete the grid.
| 15 | 16 | 18 | 21 | 23 | |
| 17 | 2 | 4 | 6 | ||
| 19 | 2 | 3 | 5 | ||
| 17 | 3 | 2 | |||
| 20 | 2 | 6 | 7 | 4 | |
| 20 | 4 | 3 |