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Home > Logic > Weights and Scales
These problems relate to objects of different weight, and using a balanced scale to determine the odd item, be it a false coin, or an under-filled sack of grain. (Usually it's coins though)
Difficulty: 4 of 5 Latest: Upgrade to 13 Rating: 3.00
The classical problem of eliminating a false coin out of 12 given can be solved using three steps of weighing by a simple level-balance, even without prior knowledge of the false coin being heavier or lighter than the standard coins.

Solve the same problem for 13 coins (i.e. 12 normal, one false , 3 steps to establish which is the different one and whether it is lighter or heavier), provided you may use a balance-scale with non-equal arms.


(No Solution Yet, 3 Comments) Submitted on 2011-02-16 by Ady TZIDON   
Page 1 of 5   next >>    
Difficulty: 3 of 5Weights that check themselves. |
Posted on 2010-11-23 by broll (Solution Posted, 6 Comments)
Difficulty: 3 of 5Precariously Balanced |
Posted on 2009-12-22 by brianjn (Solution Posted, 10 Comments)
Difficulty: 3 of 5Multipan Balance | Rating: 3.00
Posted on 2009-01-18 by Brian Smith (No Solution Yet, 3 Comments)
Difficulty: 2 of 5True coins, fake coins | Rating: 5.00
Posted on 2008-10-23 by pcbouhid (Solution Posted, 6 Comments)
Difficulty: 2 of 5Water at 76º C | Rating: 4.00
Posted on 2008-06-17 by pcbouhid (Solution Posted, 5 Comments)
Difficulty: 3 of 5Circular Balance | Rating: 2.50
Posted on 2008-03-20 by brianjn (Solution Posted, 22 Comments)
Difficulty: 3 of 5Unreliable scale | Rating: 3.00
Posted on 2008-02-28 by FrankM (Solution Posted, 3 Comments)
Difficulty: 3 of 5Four Coins and Three Weighings | Rating: 4.33
Posted on 2007-03-08 by Brian Smith (Solution Posted, 10 Comments)
Difficulty: 3 of 5Weighing Coins |
Posted on 2007-02-21 by Dennis (Solution Posted, 5 Comments)
Difficulty: 5 of 5Ceremonial Stones | Rating: 3.00
Posted on 2006-11-14 by Bractals (Solution Posted, 25 Comments)
Difficulty: 5 of 5Radioactive Coins | Rating: 4.40
Posted on 2006-10-17 by David Shin (No Solution Yet, 13 Comments)
Difficulty: 3 of 5Which is Which | Rating: 3.00
Posted on 2006-07-07 by Salil (No Solution Yet, 14 Comments)
Difficulty: 3 of 5I Only Need Two - Part II | Rating: 4.25
Posted on 2006-01-23 by Vernon Lewis (Solution Posted, 1 Comments)
Difficulty: 3 of 5I Only Need Two | Rating: 3.50
Posted on 2005-11-09 by Brian Smith (Solution Posted, 5 Comments)
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