Use k as the constant of proportionality to write the equation expressing the relationship: y varies inversely as x. if y = 25 and k = 50, what is x? 1/2 2 1,250

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?