Final answer:
The subject of this question is Mathematics. The unknowns in this question are represented by variables, such as 'n' which stands for the number of teams participating in the competition.
Step-by-step explanation:
The subject of this question is Mathematics. The question is related to a math competition where teams wrote questions for each other and the judges scored the questions. The unknowns in this question are represented by variables, such as 'n' which stands for the number of teams participating in the competition.
For example, if there are 'n' teams, then each team wrote 2 questions for the other teams. So the total number of questions is 2 multiplied by the number of teams. And if the judges scored a total of 40 questions, we can set up an equation: 2n = 40, or simplifying further, n = 20. Hence, 'n' represents the number of teams participating in the competition.