1. **Problem:** A bag of popcorn contains 483 calories and serves 3.5 people. How many calories are in each serving? 2. **Formula:** To find calories per serving, divide total calories by number of servings: $$\text{Calories per serving} = \frac{\text{Total calories}}{\text{Number of servings}}$$ 3. **Calculation:** $$\text{Calories per serving} = \frac{483}{3.5}$$ 4. **Simplify the fraction:** $$\frac{483}{3.5} = \frac{483}{\cancel{3.5}} \times \frac{10}{\cancel{10}} = \frac{4830}{35}$$ 5. **Divide:** $$\frac{4830}{35} = 138$$ 6. **Answer:** Each serving contains **138 calories**.