Given that Sequoya has 1/2 liter of apple juice and this fills 1/3 of her glass, we can show the proportion for this as 1/2 : 1/3. So in every 1/2 liter is 1/3 of her glass. So to know the answer for this, we just have to do the cross multiplication, and the answer would be 2/3 of her glass. So if she has 1 liter of apple juice, this would fill 2/3 of her glass. Hope this answers your question.