16 pages of A4 fit into an A0
You have failed to include needed information:How thick of sheet, probably stated in gauge if for thin sheet metal.How long and wide.And did you really mean Iron sheet? This is not available anymore,...
You can obtain 16.If you think about it, 2 A5s go into 1 A4, 4 A5s go into 1 A3, 8 A5s go into 1 A2, and 16 A5s go into 1 A1.
Paper is usually packed in a REAM, which is 500 sheets. So it would depend on how many reams are in the case.
Usually around 5 grams.