## Subject (1).

b) Fill in the free cell in Line 1 with the appropriate number so that the numbers written in this line follow the rule according to which the other three lines are filled. ......................................................... 3 points

| Line 1 | 5 | 8 | $?$ | 6 |
| :--- | :---: | :---: | :---: | :---: |
| Line 2 | 16 | 20 | 14 | 12 |
| Line 3 | 34 | 25 | 18 | 16 |
| Line 4 | 20 | 28 | 45 | 31 |