The Answer is 2 Glasses of Soda filled each with 500ml. This is true because 1 liter is equal to 1,000 ml and since each glass can hold 500 ml then this is the equation that would help: 1000x/500=? which x represents the number of liters have. So I would just plug in the number of liters to get the answer in this case its just one so 1000(1)/500=2. Hope this clarification Helped out.