[tex]\bf \begin{array}{ccll}
guests&\stackrel{lbs}{chocolate}\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
1&\frac{9}{10}\\\\
g&45
\end{array}\implies \cfrac{1}{g}=\cfrac{\frac{9}{10}}{45}\implies \cfrac{1}{g}=\cfrac{\frac{9}{10}}{\frac{45}{1}}\implies \cfrac{1}{g}=\cfrac{9}{10}\cdot \cfrac{1}{45}
\\\\\\
\cfrac{1}{g}=\cfrac{9}{450}\implies \cfrac{1\cdot 450}{9}=g[/tex]
and pretty sure you know how much that is.
