Maybe this will help you get started:

Austin has 16 CUPS of milk, because he can make at LEAST 2 containers which requires at least 6 cups of milk. Also, he has 1 gallon of milk (If he had 7 times as much milk, he would have 7 gallons...) which is 16 cups. Also, 1 cup= .5 pint, so 9 pints= 18cups which means that Oliva has 7 cups of sugar (18cups-11cups=7cups) For the same reason, Devin has 3 cups of sugar (10 cups-7 cups=3 cups). Also, 5. The person that has 3 cups of sugar, has 17 cups less sugar than cups of milk. tells us that Devin has 20 cups of milk since we've already found that he's the one with 3 cups of sugar. Also, this 1. The person that has 10 cups of sugar has 2 cups less sugar than milk. I think has to refer to Will, because we know how much sugar Devin and Oliva have (3 and 7 cups respectively) and how much milk (16 cups) Austin has. That leaves Will to have 10 cups of sugar, and 12 cups of milk. Keep in mind that 1 cup is equal to .249993 quarts approximately, and go from there...

Does that at least help you get started ?