## Number Challenge from Will Shortz and NPR

*October 18, 2017 at 8:07 am* *
2 comments *

Typically, the NPR Sunday Puzzle involves a word-based challenge, but this week’s challenge was a number puzzle.

[This challenge] comes from Zack Guido, who’s the author of the book

Of Course! The Greatest Collection of Riddles & Brain Teasers for Expanding Your Mind. Write down the equation

65 – 43 = 21You’ll notice that this is not correct. 65 minus 43 equals 22, not 21. The object is to

move exactly two of the digits to create a correct equation. There is no trick in the puzzle’s wording. In the answer, the minus and equal signs do not move.

Seemed like an appropriate one to share with the MJ4MF audience. Enjoy!

Entry filed under: Uncategorized. Tags: math, NPR, puzzle, Sunday, Zack Guido.

1.Roger | October 22, 2017 at 9:45 pmThanks for the info. I’ve got an answer but won’t submit it, since I can’t be available in case they call on Thursday. 😉 Leave a comment if you’d like to compare notes…

2.venneblock | October 24, 2017 at 7:49 amThe NPR contest is open to the public until this Thursday. We should delay any discussion till after then. Thanks!