Matchstick Math Number 3E
RAY: The hint that I gave is that when I presented this to my younger son, Andrew, the other day, he got the answer after he had left the room and returned. As he stood there at my side and looked at the equation, he said, "Gee, I don't know, Dad. I can certainly move a match and make the thing correct," And I told him, "Well, you don't have to move any matches." Wow. And he walked out of the room bewildered, and when he came back he had the answer, because if you walk around to the other side of the table and look at the equation...
TOM: You see it upside down.
RAY: You see it as X equals I plus IX.
RAY: And you have to move no matches to make the equation correct. Who's our winner this week, Tommy?
TOM: The winner is Jim Shaughnessy from Troy, New York. Congratulations!
[ Car Talk Puzzler ]