The shorter parallel side of a trapezoid is equal to its height, and the longer side is 3/2 times as long. if the area is 80, find the length of the shorter side.

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?