8. In the school Spartakiad, teams from classes $8^{\mathrm{A}}$, $8^{\mathrm{E}}$, and $8^{\mathrm{B}}$ participated. In each of the competitions, one of these teams took 1st place, another took 2nd place, and another took 3rd place. After the Spartakiad, points were tallied: $x$ points were awarded for 1st place, $y$ for 2nd place, and $z$ for 3rd place $\left(x>y>z>0\right.$ - integers). In the end, team $8^{\mathrm{A}}$ received 22 points, and teams $8^{\text {B }}$ and $8^{\text {E }}$ each received 9 points. How many competitions were there in total, and which team took 2nd place in the grenade throwing competition, given that the team $8^{\mathrm{B}}$ took 1st place in the vault over the "buck"?
Answer: 5 competitions, $8^{\text{B}}$.

Solution: See the solution to problem 7 for 8th grade.