The adapter draws 5A AC -- so a 6A adapter will work fine.  So too would replacing the AC cable with the correct one.  
So recently I got a Dell G3 5520 with a 240 W adapter. It came with a 16 Amp plug. I cannot find a 16 Amp plug in my room, can I use a 6 Amp to 16 Amp converter with my laptop without any problems? The attached is the ratings of the adapter.[IMAGE]
Dell 240W Adapter Input