\[1)\ 6 \cdot \frac{1}{3} = 6 \cdot 3 = 18\]
\[2)\ a\ :4 = 18\]
\[a = 18 \cdot 4 = 72.\]
\[3)\ b\ :10 = 18\ \ \]
\[b = 18 \cdot 10 = 180.\]
\[Ответ:a = 72;\ \ b = 180.\]