Question

Bill is on his way home in his car. He has driving 20 miles so far, which is four-fifths of the way home. What is the total length of his drive?

Answer 1

To answer this questions we can use the rule of three:

$\begin{gathered} 20\rightarrow\frac{4}{5} \\ x\rightarrow1 \end{gathered}$

Then:

$\begin{gathered} x=\frac{1\cdot20}{\frac{4}{5}} \\ =\frac{20}{\frac{4}{5}} \\ =\frac{5\cdot20}{4} \\ =\frac{100}{4} \\ =25 \end{gathered}$

Therefore, the total lenght of the dirve is 25 miles.