## Task 1 - 050621

In a furniture factory, the monthly production of tables was increased by 10 tables. The annual production amounted to 1920 tables.

How many tables were produced in June and how many in December?
If the number of tables produced in January is denoted by $x$, the following table can be created:

| Month | Number of tables produced |
| :--- | :---: |
| January | $x$ |
| February | $x+10$ |
| March | $x+20$ |
| April | $x+30$ |
| $\ldots$ |  |
| December | $x+110$ |

If production had not been increased, i.e., if the same number of tables as in January had been produced each month, the total number of tables produced in the entire year would have been 1960 - $660=$ 1260.

The number of tables produced in January is therefore 1260 : $12=105$, and thus the number of tables produced in June is $105+50=155$ and the number of tables produced in December is $105+110=215$.