Monday, December 14, 2009

Weekend Edition Puzzle



While listening to NPR's Weekend Edition yesterday, I heard the following puzzle, which was created by Scott Kim:
Name five two-digit numbers that are evenly spaced out — like 32, 34, 36, 38 and 40 — in which all 10 digits from 0 to 9 are used once each. What numbers are these?
My son came up with one answer, which I thought was the only one, but when I gave it as extra credit to my students today as they were taking their exam I saw two other correct answers as well. Can you solve solve this puzzle? Can you come up with more than one answer?

After December 17, 2009 I will put the answers I am aware of in the comments section. No fair peeking until you've come up with a solution of your own! If you come up with one I do not have listed, please comment and let me know!

If you're looking for more of this sort of puzzle you may want to get ahold of Scott Kim's 2010 calendar called "Mind Benders and Brainteasers." AND BY THE WAY, if you are reading this before December 17, 2009, you can still submit your answer to NPR. Go to Weekend Edition at http://www.npr.org/templates/story/story.php?storyId=121382258 for details.