Since the cat is already out of the bag, I’ll show my working, as they say in the exam papers. If one can move only one match, it has to be a vertical or a horizontal one, becasue moving any of the others will mean they are no longer numbers. There are thus only two possibilities, and only one of them is right.

XV+V=XX

Had to be one party pooper, didn’t there?

I was just coming here to to exactly that, James, having worked it out – he beat me by about an hour!

They’re all effing getting it first go. I just had a phone call with the answer and that’s the truth. 🙂

And I worked it out?!!! Make that about 20 minutes – duh!

Darn it – I was right the first time!

Took me all of 20 seconds.

Since the cat is already out of the bag, I’ll show my working, as they say in the exam papers. If one can move only one match, it has to be a vertical or a horizontal one, becasue moving any of the others will mean they are no longer numbers. There are thus only two possibilities, and only one of them is right.