Question

Carmen drove 240 miles using 9 gallons of gas. At this rate, how many gallons of gas would she need to drive 216 miles? gallons

Answer 1

We are given that 240 miles are driven using 9 gallons of gas. To determine the gallons of gas needed to drive 216 miles we use a rule of three like this:

$\begin{gathered} 240mi\rightarrow9gal \\ 216mi\rightarrow x \end{gathered}$

Now, we cross multiply:

$(240mi)x=(216mi)(9gal)$

Now, we divide both sides by 240 mi:

$x=\frac{(216mi)(9gal)}{240mi}$

Now, we solve the operations:

$x=8.1gal$

Therefore, 8.1 gallons are needed.