1. **State the problem:** Lily has 5912 gummy bears and packs them into 16 packets. We need to find how many gummy bears are left unpacked after filling these packets. 2. **Formula used:** When dividing items into groups, the remainder represents the leftover items. The formula is: $$\text{Leftover} = \text{Total items} \mod \text{Number of packets}$$ 3. **Calculate the leftover:** $$5912 \div 16 = 369 \text{ remainder } r$$ 4. Perform the division: $$16 \times 369 = 5904$$ 5. Find the leftover by subtracting: $$5912 - 5904 = 8$$ 6. **Answer:** There are **8** gummy bears left unpacked. This means after filling 16 packets evenly, 8 gummy bears remain unpacked.