Solve for x come on can someone help me :/

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?

Carlos by 24 mi and ran 6 miles what is the ratio of the distance carlos ran to the distance he biked

Solve 2x − 1 = 11 for x using the change of base formula log base b of y equals log y over log b.