\[\boxed{\mathbf{35.}}\]
\[\textbf{а)}\ 30 + 6\ :2 = 30 + 3 = 33\]
\[25 - 10\ :2 = 25 - 5 = 20\]
\[12\ :2 + 41 = 6 + 41 = 47\]
\[26 + 12\ :3 = 26 + 4 = 30\]
\[15\ :3 + 40 = 5 + 40 = 45\]
\[55 - 20\ :2 = 55 - 10 = 45\]
\[\textbf{б)}\ 77 - 12\ :4 = 77 - 3 = 74\]
\[16\ :4 + 43 = 4 + 43 = 47\]
\[96 + 20\ :5 = 96 + 4 = 100\]