1 gallon = 128 fluid ounces
[tex] \frac{1 gallon}{128 ounces} [/tex] = [tex] \frac{4 gallons}{x ounces} [/tex]
x ounces = 128(4) (cross multiply)
x ounces = 512 ounces
Total quantity of fluid ounces = 512 ounces
Preschool used 4 gallons of milk in a day which means preschool used 512 fluid ounces of milk in a day