Which set of three numbers could represent the lengths of the sides of a right triangle? a. 7, 9, 11 b. 8, 15, 17 c. 10, 15, 20 d. 12, 18, 22

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?