\[\boxed{\text{4.\ 240}}\]
\[\textbf{а)}\ (31 - 42) - 60 = - 11 - 60 =\]
\[= - 71\]
\[\textbf{б)} - 60 + (46 + 80) =\]
\[= - 60 + 126 = 66\]
\[\textbf{в)} - 4 - ( - 6 - 10) =\]
\[= - 4 - ( - 16) = - 4 + 16 = 12\]
\[\textbf{г)} - 5 - ( - 24 + 25) = - 5 - 1 =\]
\[= - 6\]