Answer:
Carl used a total of 3 liters of coffee in all.
Explanation:
There are 1000 milliliters (mL) in a liter, so to convert from milliliters to liters, you need to divide by 1000.
To find the total amount of coffee used, you can multiply the number of mugs by the volume of each mug:
12 mugs x 250 mL/mug = 3000 mL
To convert this to liters, you divide by 1000:
3000 mL ÷ 1000 = 3 L
Therefore, Carl used 3 liters of coffee in all.