To find out how many ounces are in 1 gallon, we can look at the relationship in the table.
According to the table:
- 5 gallons = 640 ounces
To find the number of ounces in 1 gallon, we can divide the number of ounces by the number of gallons:
\[ \text{Ounces per gallon} = \frac{640 \text{ ounces}}{5 \text{ gallons}} = 128 \text{ ounces} \]
Therefore, there are 128 ounces in 1 gallon.