A car with a 20-gallon gas tank can go 25 miles on 1 gallon of gas. If the tank is full at the beginning of a 725-mile trip, how many times does the driver have to refill the gas tank?

Answer 1

The car can go 25 miles on 1 gallon of gas, so on a full 20-gallon tank, it can go 25 x 20 = 500 miles.

If the trip is 725 miles, the driver will need to refill the gas tank 725 / 500 = 1.45 times, which means the driver will have to refill the gas tank twice during the trip.