To find out how many ounces are in one gallon, we can take the relationship given from the values provided.
From the table:
- 5 gallons = 640 ounces
To find how many ounces are in 1 gallon, we can divide the total ounces by the number of gallons:
\[ \text{Ounces per gallon} = \frac{640 \text{ ounces}}{5 \text{ gallons}} = 128 \text{ ounces} \]
Thus, there are 128 ounces in one gallon.