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Monday, March 20, 2017

Friday's math problem

I mis-stated Friday's math puzzle.  Find 2 consecutive numbers such that, when you add the digits of the first number, the sum is divisible by 7 and the sum of the digits of the second number is also divisible by 7. Sorry about that!



https://qz.com/935952/it-took-the-inventor-of-the-rubiks-cube-a-month-to-solve-his-own-puzzle/

New article about Erno Rubik.

http://www.puzzlesolver.com/puzzle.php?id=29;page=15  Very old article about Rubik.


2 comments:

  1. I commented on the other puzzle with this answer as well, which is 69999 and 70000!

    ReplyDelete
  2. Yes, you did! Just wanted to clarify what the question was supposed to say.

    ReplyDelete