Answer:
8 2
16 4
20 5
28 7
Explanation:
For each serving, there are 0.25 (or 1/4) liters. For each liter, there are 4 servings. So, just divide the number of servings by 4 to get the number of liters, and multiply the number of liters by 4 to get the number of servings!
hope this helped :)
ibrahim