Zara drove 168 miles on 8 gallons of gas. She had 155 miles left
to complete her trip. How many more gallons of gas would she need?
a. 7.2 gal
b. 7.4 gal
c. 7.6 gal
d. 7.8 gal
To find out how many more gallons of gas Zara needs, we can start by calculating her mileage per gallon:
168 miles / 8 gallons = 21 miles per gallon
This means that Zara's car can travel an average of 21 miles on one gallon of gas. Now we can find out how many more gallons she needs to travel the remaining 155 miles:
155 miles / 21 miles per gallon = 7.38 gallons
We can round up to the nearest tenth, giving us the answer of 7.4 gallons. Therefore, the correct answer is b) 7.4 gal.