Ounces of medication vary directly with the weight of the patient. If a 120lb, adult requires three-fourths of a ounce of medication, how many ounces are required for a 200lb, adult?

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?