Did you mean 1 and 1/4 gallons? Or did you mean 1 gallon + 4 gallons? I'll answer both ways:
A gallon has 128 fluid ounces. So if the question is 1 and 1/4 gallons, you divide the 128 ounces by 4, which is 32 ounces. You then add 32 + 128, which = 160 fluid ounces.
If your question is how many fluid ounces in 1 gallon + 4 gallons, you simply multiply 5 x 128, which = 640 fluid ounces.
In the US, 1 gallon is 128 fluid ounces.
128
1 gallon = 128 fluid ounces 1/2 gallon = 64 fluid ounces
There are 128 fluid ounces in a gallon.
1 fluid ounce = 0.0078125 gallon 1 gallon = 128 fluid ounces
1/4 gallon is 32 fluid ounces.
One fluid ounce equates to 0.0078125 gallon.
160 fluid ounces = 1 imperial gallon
1 gallon = 128 fluid ounces 1/2 gallon = 64 fluid ounces
There are 128 fluid ounces in 1 US gallon. There are 160 fluid ounces in 1 UK gallon.
1 US gallon = 128 fluid ounces 1 fluid ounce = 0.0078125 US gallon
1 gallon = 128 fluid ounces 1/50 of a gallon = 2.56 fluid ounces
231 fluid ounces in 1 US gallon.
1 US fluid gallon = 4 quarts