3. A sports team from one of the schools in Kaluga participated in ten shooting competitions, with each new competition they scored 2 points more than in the previous one. In the last competition, they scored 10 times more points than in the first. How many points did they score in the first and last competitions?
3. Let the number of points scored in the first competition be denoted by $a$, then in each subsequent competition, the team scored two points more than in the previous one:

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
| $a$ | $a+2$ | $a+2 \times 2$ | $a+2 \times 3$ | $a+2 \times 4$ | $a+2 \times 5$ | $a+2 \times 6$ | $a+2 \times 7$ | $a+2 \times 8$ | $a+2 \times 9$ |

In the last competition, the athletes scored ten times more points than in the first. This gives us the equation $10 a=a+2 \times 9$.

From this, we find that in the first competition they scored 2 points $(9 a=2 \times 9)$, and in the last competition, they scored 20 points $(2 \times 10=20)$.

Answer: 2 and 20.