\[\boxed{\mathbf{247.}}\]
\[1)\ 234 + 123 = 357\]
\[2)\ 241 + 135 = 376\]
\[312 + 241 = 553\]
\[425 + 122 = 547\]
\[532 + 216 = 748\]
\[617 + 152 = 769\]
\[324 + 324 = 648\]