For my university assignment one of the questions is about ideal diodes and I have NO idea how to do it!

Unfortunately I also have no idea how to draw a circuit on this forum to show you what the question looks like.

But if anyone could explain to me, in more simple terms than my crazy lecturer, how to find unknown currents and voltages in a simple ideal diode circuit, it'd be so great!

Thanks in advance to anyone who can help me.