Answer:
1/2 gallon
Explanation:
Each full gallon can be represented as 4/4 of a gallon. Since Katie bought 2 one-gallon bottles, the total amount of juice is 8/4 gallons. The number line below represents the fraction of juice that her guests drank.
The fraction of a gallon of juice left over is:
Therefore, there is 1/2 of gallon of juice left over.