Final answer:
To determine how many miles per gallon a vehicle can travel on the highway, you would estimate by dividing the number of miles driven by the number of gallons of gasoline used. This provides a general idea of fuel efficiency rather than an exact figure due to variables that can affect gas mileage.
Step-by-step explanation:
When you want to know about how many miles per gallon of gas the family vehicle can travel on the highway, you would typically estimate this figure. Gas mileage can vary based on a variety of factors including driving habits, vehicle condition, and environmental conditions. To estimate the miles per gallon, you would take the number of miles driven and divide it by the gallons of gas used during a trip. Unlike an exact number, an estimate gives you a general idea of the fuel efficiency without requiring precise measurement during every single use.
For example, one of the vehicles in question drove 400 miles and used 22 gallons of gasoline. To estimate the miles per gallon, you would divide 400 miles by 22 gallons, which gives approximately 18.18 miles per gallon. For the other vehicle that covered 8,660 miles using 69 gallons, it would be 8,660 miles divided by 69 gallons, equaling about 125.51 miles per gallon. These values give a ballpark figure of each vehicle's fuel efficiency on the highway.