To find how many ounces are in one gallon, we can look at the provided data. The relationship between gallons and ounces can be determined using the information given.
From the values:
- 5 gallons = 640 ounces
- 4 gallons = 512 ounces
- 3 gallons = 384 ounces
- 2 gallons = 256 ounces
To find the number of ounces in 1 gallon, we can use the data for 5 gallons:
\[ \text{Ounces per gallon} = \frac{640 \text{ ounces}}{5 \text{ gallons}} = 128 \text{ ounces per gallon} \]
So, there are 128 ounces in 1 gallon.