Final answer:
Ms. Ellis drove approximately 500 miles making the deliveries.
Step-by-step explanation:
To determine the number of miles Ms. Ellis drove making the deliveries, we need to know the fuel efficiency of her delivery van, measured in miles per gallon (MPG).
Let's say her van has a fuel efficiency of 20 miles per gallon. This means that for every gallon of gas, the van can travel 20 miles.
Since Ms. Ellis used 25 gallons of gas, we can multiply this by the MPG to find the total number of miles driven: 25 gallons * 20 MPG = 500 miles.