[tex]\bf \textit{so the area of the wall is then }8\frac{2}{5}\times 18\frac{1}{3}
\\\\\\
\textit{how much is }\frac{1}{2}\textit{ of that product?}\quad \cfrac{8\frac{2}{5}\times 18\frac{1}{3}}{2}\\\\
-------------------------------\\\\[/tex]
[tex]\bf \begin{cases}
8\frac{2}{5}\implies \cfrac{8\cdot 5+2}{5}\implies &\cfrac{42}{5}\\\\
18\frac{1}{3}\implies \cfrac{18\cdot 3+1}{3}\implies &\cfrac{55}{3}
\end{cases}
\\\\\\
\cfrac{8\frac{2}{5}\times 18\frac{1}{3}}{2}\implies \cfrac{\frac{42}{5}\cdot \frac{55}{3}}{\frac{2}{1}}\implies \cfrac{\frac{42\cdot 55}{5\cdot 3}}{\frac{2}{1}}\implies \cfrac{42\cdot 55}{5\cdot 3}\cdot \cfrac{1}{2}\implies \cfrac{42\cdot 55\cdot 1}{5\cdot 3\cdot 2}
\\\\\\
\cfrac{2310}{30}\implies 77[/tex]
