You can put this solution on YOUR website!
You can solve this using a proportion, which basically means a fraction = a fraction. For both, I'm going to put the number of miles over the number of gallons; if you want, you can put gallons over miles as long as you do it both times.
. My favorite way to solve this is to do cross multiplication: multiply the top left with the bottom right, and multiply the bottom left with the top right.
. Divide by 408 on both sides to get x by itself, and your final answer is
I like to go back and check by doing the division on both sides and making sure I get the same thing for both:
. Both fractions equal 27.2, so we're definitely right!