re: maths riddle - 24 hrs later
Many thanks for all your replies; at least for those on the subject. And on the others, good fun anyway. It all reminded me that we all have excedingly different minds; minds that leap off in their own directions and would prefer to focus on it's own problems than focus on a problem from outside. Or perhaps it's "Look at Me".
Nevertheless, Forrest, I agree another interesting poser. And Fred Gassitt, I suspect you are right; it is easy to come from the same starting place when they should be different. Not sure I really understand that though. cheers jwt