\[3x - первое\ число;\ \ \ \]
\[5x - второе\ число.\]
\[3x + 5x = 440\]
\[8x = 440\ \ \ \ |\ :8\]
\[x = 55\]
\[3x = 3 \cdot 55 = 165\]
\[5x = 5 \cdot 55 = 275.\]
\[Ответ:\ \ 165;\ \ \ 275.\]