Question

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

2 times.

20x25=500, and 500 is less than 725, so we’ll multiply it by two and see if it will at least get to 725. 500x2=1000, and 1000 is greater than 725, so you can fill it two times and even have a few gallons of gas left!