1. **State the problem:** A Chinese restaurant uses 225 pairs of chopsticks each day. The manager wants to order enough chopsticks for 30 days. Each box contains 750 pairs. We need to find how many boxes to order. 2. **Calculate total pairs needed:** Multiply daily usage by number of days: $$225 \times 30 = 6750$$ pairs. 3. **Calculate number of boxes:** Divide total pairs by pairs per box: $$\frac{6750}{750} = 9$$ boxes. 4. **Interpretation:** Since the result is a whole number, the manager should order exactly 9 boxes to have a 30-day supply. **Final answer:** The manager should order **9** boxes.