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Difficulty: 3 of 5 Latest: Let's make a deal (in Numbers) Rating: 5.00
DEAL * DEAL = ----DEAL
Replace dashes by decimal digits,
using reasoning only.

There is only one solution!
(No Solution Yet, 1 Comments) Submitted on 2018-02-17 by Ady TZIDON   
Difficulty: 2 of 5 Bonus: Hats off (in Logic) Rating: 2.79
Three convicts A,B and C were about to be executed. When they begged for a last chance, the hangman decided to let them battle it out with their wits.
So he put the 3 men on a flight of stairs, A at the top of the flight of stairs followed by B in the middle and then C at the base of the stairs. They are made to stand such that A can see B and C, and B can only see C, but can't see A, and C can see none.

They were then blindfolded, and on each of their head, he put a coloured cap; the colour of the cap can only either be black or white. The only thing they know for certain is that not all three hats have the same colour.
So the hangman wanted them to tell him what coloured hat is on their head within the next 5 seconds after he removed the blindfold. If any one who could guess his hat colour correctly, he would save the life of all 3 men.

After 4 seconds of his removing their blindfolds, the one in the middle {B} answered the question, and it was correct.

How did he do it?
You can assume that all the blindfolds were removed at the same moment.
(Solution Posted, 16 Comments) Submitted on 2003-03-11 by Anoop   
Difficulty: 4 of 515 letters (in Word Problems)
Posted on 2018-02-16 by Ady TZIDON (Solution Posted, 7 Comments)
Difficulty: 3 of 5Double Secant (in Geometry)
Posted on 2018-02-15 by Jer (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Four fours (in Numbers)
Posted on 2018-02-14 by Ady TZIDON (No Solution Yet, 6 Comments)
Difficulty: 2 of 5Choosing the right number (in Numbers)
Posted on 2018-02-13 by Ady TZIDON (Solution Posted, 6 Comments)
Difficulty: 2 of 5Pick-a-book meeting (in Just Math)
Posted on 2018-02-12 by Ady TZIDON (Solution Posted, 5 Comments)
Difficulty: 3 of 5Using nine positive digits (in Numbers)
Posted on 2018-02-11 by Ady TZIDON (Solution Posted, 3 Comments)
Difficulty: 3 of 5Only six distinct digits (in Numbers)
Posted on 2018-02-10 by Ady TZIDON (Solution Posted, 1 Comments)
Difficulty: 3 of 5En francais seulement ! (in Numbers)
Posted on 2018-02-09 by Ady TZIDON (Solution Posted, 3 Comments)
Difficulty: 3 of 5Find the arc (in Geometry)
Posted on 2018-02-08 by Kenny M (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Square pairs (in Just Math) Rating: 5.00
Posted on 2018-02-07 by Ady TZIDON (Solution Posted, 3 Comments)
Difficulty: 2 of 5Not all a's are in (in Numbers)
Posted on 2018-02-06 by Ady TZIDON (Solution Posted, 3 Comments)
Difficulty: 2 of 5Carpenter's pricing (in Just Math)
Posted on 2018-02-05 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Random log (in Probability)
Posted on 2018-02-04 by Charlie (Solution Posted, 1 Comments)
Difficulty: 3 of 5Incenter and a half (in Geometry)
Posted on 2018-02-03 by Jer (No Solution Yet, 2 Comments)

Recently Posted Solutions:
Difficulty: 3 of 5A meeting point (in Just Math)
Submitted By Ady TZIDON. Solution posted on 2018-02-18 03:11:49
Difficulty: 4 of 515 letters (in Word Problems)
Submitted By Ady TZIDON. Solution posted on 2018-02-17 00:54:17
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