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.
| 19 | 17 | 23 | 20 | 21 | |
| 20 | 4 | 3 | 4 | ||
| 23 | 5 | 6 | |||
| 22 | 1 | ||||
| 13 | 2 | 2 | 1 | ||
| 22 | 7 | 4 |