Answer:
15 people will be served before the cooler would be empty
Step-by-step explanation:
Here, we want to know the number of persons that could be served if the total amount of water available is 7.5L and each serving is 500 milliliters
What we are going to do here is to divide the total amount of water available by the number of individual servings
Mathematically, that would be;
7.5L / 500 milliliters
So we need to convert 7.5L to milliliters
Since 1000 mL = 1L ; 7.5 L = 7.5 * 1000 = 7500 mL
So the number of people served will be;
7500/500 = 15 people