By installing efficient water fixtures, the average american can reduce water use to about 45 gallans of water per day. using such water fixtures, about how many gallons of water would the averae american use in december?

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?