I can't complete the equation or the sentence because they have not been provided. However, I can write you an equation to model this situation.
Answer:
18x6=108
Explanation:
If each table seats 6 people, there are 18 tables, and we are trying to find the total number of seated persons, it can be modeled as such:
tables x capacity of each table=total number of seated persons
plug in:
18x6=108