Answer: She will have 200 milliliters of lemonade left after filling the bottles. 
Explanation:
Hi, since 1 liter = 1000 milliliters 
For 16.3 liters: 16.3 x 1000 = 16,300 milliliters (1 batch) 
She made 2 batches. 
16,300ml x2 = 36,600 milliliters 
We have the total amount of lemonade in two batches; we have to divide it by the capacity of each bottle (400 ml), to calculate how many bottles she can fill. 
36,600 milliliters / 400 milliliters = 81.5 bottles 
She can fill 81 bottles and she will have a leftover of half a bottle. 
Since each bottle is 400 milliliters, half of it: 
400/2 = 200 milliliters 
She will have 200 milliliters of lemonade left after filling the bottles.