We will use subtraction to solve this. We will subtract 5 3/4 from 8 3/8, because we must take away the amount she used.
8 3/8 - 5 3/4
The easiest way to solve this is to convert to fractions.
67/8 - 23/4
We must create common denominators to solve this. We will multiply both 23 and 4 from the second fraction by 2 to get to a common denominator of 8.
67/8 - 46/8 = 21/8
We will then convert this fraction back to a mixed number.
21/8 = 2 5/8
2 5/8 liters is our final answer