Skip to content

Instantly share code, notes, and snippets.

@ssirowy
Last active December 24, 2015 02:29
Show Gist options
  • Save ssirowy/6731415 to your computer and use it in GitHub Desktop.
Save ssirowy/6731415 to your computer and use it in GitHub Desktop.
ROTW 9/27/2013
You must answer both to win ROTW. Please PM or email your answers to me.
A) Place the numbers 1 through 9 in the circles in the linked image, such that each side of
the triangle adds up to 17
http://www.expandyourmind.com/logicproblems/images/9numbers.gif
Answer: There are a number of answers, but one formula to get an answer is to put 1,
2 and 3 on the corners, and 7,8,9 on opposite sides. Then fill in the gaps with
the other numbers to make 17 on each side.
B) There are 100 coins scattered in a dark room. 90 have heads facing up and 10 have tails up.
You cannot distinguish (by feel, etc.) which coins are which. How do you sort the coins into two
piles that contain the same number of tails? (i.e each pile has the same number of tails up)
Answer: Create 2 piles, one with 10 coins and one with 90. Then, with the 10
coin pile, flip all of them. The resulting piles will have the same number of tails.
It works =)
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment