Let's pay close attention to the given rate.
\begin{gathered}
\dfrac{36\text{ lb}}{\$\,\textcolor{lightblue}{\boxed{\phantom{\dfrac{2}{2}\textcolor{black}{2}}\phantom{\dfrac{2}{2}}}}{\phantom{\text{-}}}}
=
\dfrac{9\text{ lb}} {\stackrel{\phantom{1}}{\$\,\small{6}}}
\end{gathered}
We need to find the number that we can multiply 9 by to get 36.
9* ? =36
We multiply 9 by 4 to get 36, so we will also multiply 6 by 4 to find an equivalent rate.
