18. School A and School B each send out 5 students to participate in a long-distance running competition. The rule is: The $\mathrm{K}$-th student to reach the finish line gets $K$ points (no students arrive at the finish line simultaneously). The team with fewer total points wins. Therefore, the winning team's total score has ( ) possibilities.
【Analysis】The two teams scored a total of $1+2+\cdots+10=55$ points, the winning team scored at least $1+2+3+4+5=15$ points, and at most 27 points, so there are 13 possible outcomes.