To find the total number of pizzas sold by the Pizza Brothers food truck, we first need to determine how many pepperoni pizzas were sold.
- The number of cheese pizzas sold is given as 534.
- The food truck sold 321 more pepperoni pizzas than cheese pizzas. Therefore, we can calculate the number of pepperoni pizzas sold as: \[ \text{Pepperoni pizzas} = \text{Cheese pizzas} + 321 = 534 + 321 = 855 \]
Now that we have the number of cheese pizzas and pepperoni pizzas sold, we can calculate the total number of pizzas sold:
\[ \text{Total pizzas} = \text{Cheese pizzas} + \text{Pepperoni pizzas} \] \[ \text{Total pizzas} = 534 + 855 = 1389 \]
Thus, the total number of pizzas sold is 1389.