Most efficient way to grow 25 plants?

[Waka]

I have 3m×4m×2.5m grow tent and wanted to know if there was a way to grow 25plants effectively in the grow tent.if you have a way please let me know in detail.
hydro system is preferable but soil is good too

 

[TriangleCheese]

You can go for autoflowers if you want 25 plants for sure.

 

[TriangleCheese]

Or you can go for Sea of green. Instructions everywhere.