\[\boxed{\ \mathbf{619\ (619)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[a = 12\ м,\ \ \ b = 15\ м,\ \ \ c = 6\ м\]
\[V = abc = 12 \cdot 15 \cdot 6 =\]
\[= 12 \cdot 90 = 1080\ м^{3}.\]
\[Ответ:1080\ м^{3}.\]
\[\boxed{\mathbf{619}.\ }\]
\[53 + a\ кратно\ 7:\]
\[a = 3.\]