Each glass has a capacity of 6 ounces, but they are only filled to 4/5 of their capacity.
So, each glass is filled with 6 * 4/5 = 24/5 = 4.8 ounces of water.
To fill all 10 glasses to the brim, we need to add 10 * (6 - 4.8) = 10 * 1.2 = 12 additional ounces of water.
#### 12
The answer is: 12
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If there are 10 glasses that each have a capacity of 6 ounces but are only filled to 4/5 of their capacity, how many additional ounces of water are needed to fill all 10 glasses to the brim?

### Answer:
