5. Determine the unknown number $x$ and explain.

| 9 | 22 | 13 | 16 |
| :---: | :---: | :---: | :---: |
| 144 | 176 | 143 | 192 |
| 16 | 8 | 11 | $x$ |

Tasks worth 10 points
5. Since $144: 9=16$, $176: 22=8$ and $143: 13=11$, then it must also be so in the last column.

2 points

Therefore, $x=192$ : 16, which means $x=12$.

2 points

TOTAL 4 POINTS