to calculate the miles per gallon (mpg) of the fuel-efficient car, we can divide the number of miles the car can travel on one tank of gas by the number of gallons of gas in the tank:
mpg = miles per tank / gallons per tank
In this case, the car can travel 500 miles on one tank of gas, and the gas tank holds 16 gallons:
mpg = 500 miles / 16 gallons
Simplifying this expression, we get:
mpg = 31.25
Therefore, the miles per gallon of the fuel-efficient car is 31.25