If you drove 300 miles and used 20 gallons a gas how many miles to the gallon did you get?

Answer 1

15 mpg (miles per gallon).

The key to this 'word problem' is understanding that "miles to the gallon" or more commonly, 'miles per gallon', means DIVISION. So, 300 miles per 20 gallons means:

(300 miles) / (20 gallons) = 15 miles per gallon.

Answer 2

You just drove your car 350 miles and used 30 gallons of gas. You know that the gas tank on your car holds 1612 gallons of gas. If the gas you buy costs $3.00 per gallon, what would you pay to fill one-half of your tank?