\[\boxed{\mathbf{822\ (822).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[b_{2} = 12;\ \ q = \frac{1}{3}\]
\[b_{2} = b_{1} \cdot q\ \]
\[b_{1} = \frac{b_{2}}{q} = \frac{12 \cdot 3}{1} = 36\]
\[Ответ:b_{1} = 36.\]