If they have 2 quarts of juice, it means that they have half a liter altogether. If they intend to share the juice evenly, they just need to serve 1 quart of juice for each other and they will drink the same quantity in juice.
To better understand it, read the explanation shown below:
- Luke and Ava have 2/4 of juice (it means they have half the amount from the total: 2 parts out of 4 parts = 500 ml out of 1.000 ml). If they share it evenly:
Luke gets 1/4 of juice (that is to say, 250 ml) and Ava gets the remaining 1/4 of juice (that is to say, 250 ml).