At a wedding reception, an equal number of guests were seated at 12 round tables. The 13 people in the wedding party were seated at a rectangular table. There were 121 people at the reception altogether. Which equation could you use to find the number of guests, n, seated at each round table? 12 + 13n = 121 12n + 13 = 121 121 = 12n – 13 121 = 13n – 12