## Elementary Algebra

Let X represent the amount of gasoline required to travel 238 miles. Now, let’s set up a proportion in which one ratio compares the amounts of gasoline and the other ratio compares the corresponding distance. So, $\frac{10}{X}$ = $\frac{170}{238}$ We cross multiply to obtain: 10 $\times$ 238 = X $\times$ 170 2380 = 170X Divide both sides by 170. X = 14 The car will need 14 gallons of gasoline to travel 238 miles.