\[\frac{С}{Я} = \frac{2}{3};\ \ \ \ \frac{Я}{В} = \frac{6}{1};\ \ \ \ \frac{С}{Я} = \frac{2}{3} = \frac{4}{6} \Longrightarrow\]
\[\Longrightarrow С \longrightarrow 4;\ \ \ Я \longrightarrow 6;\ \ В \longrightarrow 1.\]
\[\frac{С}{В} - ?\ \ \ \ \ \ \ \ \frac{С}{В} = \frac{4}{1}.\]
\[Ответ:\ 4\ к\ 1.\]