Final answer:
To cook 12 hamburgers using a grill that holds 4 hamburgers, you will need to cook 3 batches of burgers.
Step-by-step explanation:
To cook 12 hamburgers using a grill that holds 4 hamburgers, you will need to cook the hamburgers in batches. Each batch will consist of the maximum number of hamburgers that can be cooked at once, which is 4. So, to cook 12 hamburgers in total, you will need to cook 3 batches of burgers.