Question 13
In the table, the correct additions were performed in the squares according to the pattern shown. What number should replace the question mark?
| + | 10 | 7 |
|---|---:|---:|
| 5 | 15 | 12 |
| Hidden | 14 | ? |
Original coloured table (editable table above):

| + | 10 | 7 |
|---|---:|---:|
| 5 | 15 | 12 |
| Hidden | 14 | ? |
Original coloured table (editable table above):
