Kim and her 2 brothers each use 1 1/2 cups of milk for breakfast. How many fluid ounces of milk do they use in 4 day's

The amount of fluid used in 4 days will be 18 ounces

Step-by-step explanation:

Since each of them use 1 1/2 cups and they are 3

so the collective amount in 1 day will be

3 * 1 1/2 = 9/2

Now

The amount in 4 days will be

4 * 9/2 = 18

Therefore they will collectively use 18 ounces in 4 days