Dave can drive 160 miles on a tank of gas. Approximately how many tanks of gas will he need to drive 880 miles?

How many times does he have to drive 160 miles in order to cover 880 ? 880/160 = 5.5 times He'll need  5 complete tanks of gas, and 1/2 of another one.

[latex]160\ miles\ \rightarrow\ \ 1\ tank\ of\ gas\\880\ miles\ \rightarrow\ x\\\\160\cdot x=880\ /:160\\\\x= \frac{880}{160} \ \ \ \Rightarrow\ \ x= \frac{11}{2} \ \ \ \Rightarrow\ \ x= 5.5\\\\Ans.\ 5.5\ tank\ of\ gas[/latex]