鉄 and 銅: material and object form
Name iron and copper as materials, using の for composition and で with making.
Naming iron
鉄, read てつ, means iron. 鉄の棒を運びました。 means carrying an iron bar. 棒 identifies the object's form.
鉄で作られた門 describes a gate made of iron. It identifies the material rather than iron as a tool.
Naming copper
銅, read どう, means copper. 銅の板を切りました。 means cutting a copper sheet.
銅を使って飾りを作りました。 says that someone made an ornament using copper. It reports a completed past action.
Material and weight
鉄と銅の板を一枚ずつ用意しました。 means preparing one iron sheet and one copper sheet, for two sheets in total.
同じ大きさですが、重さは測っていません。 says that they have the same size but have not been weighed. Do not supply an unstated measurement from the material names.
How many sheets were prepared in 鉄と銅の板を一枚ずつ用意しました?
Show the answer and why
Two: one iron sheet and one copper sheet.