[tex]x-vanilla\ extract\\\\From\ proportion:\\\\\frac{2}{5}\ \ \ -\ \ \ 6\\x\ \ \ \ -\ \ 18\\\\6x=\frac{2}{5}\cdot18\\\\6x=\frac{36}{5}\ \ \ \ \ \ \ |\cdot\frac{1}{6}\\\\x=\frac{36}{5}\cdot\frac{1}{6}\\\\x=\frac{6}{5}=1\frac{1}{5}\\\\He\ need\ 1\frac{1}{5}\ vanilla\ extract.[/tex]
