To find how much lemonade she will have left over, you will first need to convert 4.6 L to 4600 mL.
Second, break the 4600 mL into groups of 300 mL. Each group represents the amount in one bottle. Use division to get this answer.
You will get 15 1/3. This means you will be able to fill 15 full bottles, and 1/3 of the 300 is 100 mL left.
Sarita will have 100 mL of lemonade left after filling bottles.