§ Задание 25
\[\boxed{\mathbf{25}\mathbf{.}}\]

\[\textbf{б)}\ 12\ :3 \cdot 8 = 4 \cdot 8 = 32\]
\[4 \cdot 6\ :3 = 24\ :3 = 8\]
\[8\ :2 \cdot 10 = 4 \cdot 10 = 40\]
\[\boxed{\mathbf{25}\mathbf{.}}\]

\[\textbf{б)}\ 12\ :3 \cdot 8 = 4 \cdot 8 = 32\]
\[4 \cdot 6\ :3 = 24\ :3 = 8\]
\[8\ :2 \cdot 10 = 4 \cdot 10 = 40\]