1. **State the problem:** A bakery uses 30 kg of an ingredient per day. We want to find out how many 2.5 kg units they use per day. 2. **Set up the division:** To find the number of 2.5 kg units in 30 kg, divide 30 by 2.5. 3. **Calculate the number:** $$\frac{30}{2.5} = 12$$ 4. **Interpretation:** The bakery uses 12 units of 2.5 kg per day.