On a trip, you had to change your money from dollars to british pounds. you got 560560 pounds for 800800 dollars. which is a unit rate that describes the exchange?

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?