\[\boxed{\mathbf{209.}}\]
\[Увеличить\ на\ 20.\]
\[222 + 20 = 242\]
\[333 + 20 = 353\]
\[444 + 20 = 464\]
\[555 + 20 = 575\]
\[666 + 20 = 686\]
\[777 + 20 = 797\]
\[Уменьшить\ на\ 20.\]
\[222 - 20 = 202\]
\[333 - 20 = 313\]
\[444 - 20 = 424\]
\[555 - 20 = 535\]
\[666 - 20 = 646\]
\[777 - 20 = 757\]