If they are the Mario Brothers, then are their names Luigi Mario and Mario Mario?
MARIO + BRO = LUIGI
Definitely doable by hand. Solutions are below the image.
SPOILER SOLUTIONS!
| MARIO_first | BRO_second | LUIGI_third |
|---|---|---|
| 19847 | 587 | 20434 |
| 19863 | 783 | 20646 |
| 39526 | 756 | 40282 |
| 49826 | 386 | 50212 |