\[\boxed{\mathbf{16}\mathbf{.}}\]
\[\textbf{а)}\ 37 + 10 + 4 = 47 + 4 = 51\]
\[19 + 20 + 5 = 39 + 5 = 44\]
\[28 + (11 - 2) = 28 + 9 = 37\]
\[55 + (20 - 14) = 55 + 6 = 61\]
\[\textbf{б)}\ 67 - (18 + 9) = 67 - 27 =\]
\[= 40\]
\[93 - 41 + 29 = 52 + 29 = 81\]