Give the step-by-step reasoning process and then the final answer. Alyana has a pizza that is cut into 16 slices. After she and her friends finish eating, there are 4 slices left. If each of them ate 2 slices of pizza, how many people ate the pizza?
16 - 4 = 12 slices of pizza were eaten. So there were 12 / 2 = 6 people eating the pizza.
The final answer: 6.