Final answer:
David bought 400 fluid ounces of milk. This was determined by multiplying 3.125 gallons by 128 fluid ounces per gallon.
Step-by-step explanation:
The student is asking how many fluid ounces are in 3.125 gallons of milk. To find this, we need to convert gallons to fluid ounces.
First, we know that 1 gallon is equivalent to 128 fluid ounces. So, let's set up the calculation:
3.125 gallons × 128 fluid ounces/gallon
Now, multiply the number of gallons by the unit equivalence:
3.125 × 128 = 400 fluid ounces
So, David bought 400 fluid ounces of milk for the party.