2. A coffee shop uses 4 liters of milk every day. a. If there are 15 liters of milk in the refrigerator, after how many days will more milk need to b purchased? Explain how you know.

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To determine after how many days more milk will need to be purchased, follow these steps:

1. **Daily Milk Usage:**  
   The coffee shop uses **4 liters** of milk each day.

2. **Total Milk Available:**  
   There are **15 liters** of milk available in the refrigerator.

3. **Calculate the Number of Days:**  
   Divide the total milk available by the daily usage to find out how many full days the milk will last:

$$
   \text{Number of Days} = \frac{\text{Total Milk}}{\text{Daily Usage}} = \frac{15 \text{ liters}}{4 \text{ liters/day}} = 3.75 \text{ days}
   $$

4. **Interpret the Result:**  
   - **3.75 days** means that after **3 full days**, there will be **0.75 days' worth** of milk left. 
   - On the **4th day**, the milk will run out before the day concludes.

5. **Conclusion:**  
   **More milk will need to be purchased after 3 days.**

- **Reasoning:**  
     - **After 3 days:**  
       $$
       3 \text{ days} \times 4 \text{ liters/day} = 12 \text{ liters}
       $$  
       Remaining milk:  
       $$
       15 \text{ liters} - 12 \text{ liters} = 3 \text{ liters}
       $$  
       Since **3 liters** are left and the shop uses **4 liters** per day, there's **not enough milk** to cover the entire **4th day**.
   
   - **Therefore:**  
     On the **4th day**, the milk in the refrigerator will be insufficient, and more milk will need to be purchased.

**Summary:**  
After **3 days**, the available milk won't be enough for the **4th day**, necessitating the purchase of more milk.
After 3 days, the coffee shop will need to purchase more milk because there won't be enough milk left for the 4th day.

2. A coffee shop uses 4 liters of milk every day. a. If there are 15 liters of milk in the refrigerator, after how many days will more milk need to b purchased? Explain how you know.

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