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Bacterium Algebra, arithmetic  Weight: 1 Liked the puzzle: 91% 26.12.2009
A certain type of bacteria double every second. If we put one bacterium in a Petri dish, the dish will fill in 1 minute. How long will it take to fill the dish, if we start with 2 bacteria?
Comments:  3 | check your solution  
Two incense sticks Logic puzzles  Weight: 1 Liked the puzzle: 100% 27.12.2009
You have two incense sticks, that burn unevenly, and a lighter. Each will burn for an hour. How can you time 45 minutes using nothing but these tools.
Comments:  4 | check your solution  
A forger Weighing puzzles  Weight: 1 Liked the puzzle: 87% 27.12.2009
A Megamind owns a mint with a 100 workers. Each day, he gives 1kg of gold to each worker, and each worker must make 100 coins (10 grams each). The Megamind learnt that one nof the workers is a forger, he makes coins that are 1g lighter. How can Megamind determine the forger using only one weighing? The scales can determine the total weight, up to 100 kg.
Comments:  1 | check your solution  
Two coins Puzzles for children  Weight: 1 Liked the puzzle: 84% 28.12.2009
A Megamind has two coins that are jointly worth 15 cents. One coin is not a nickel. What are these coins?
Comments:  5 | check your solution  
8 coins Weighing puzzles  Weight: 1 Liked the puzzle: 100% 30.12.2009
You have 8 coins that appear to be identical, except one (which is counterfeit) is slightly heavier than the others. What is the minimal number of weighings on the balance scale that is required to find the counterfeit coin?
Comments:  1 | check your solution  
A 100 M&Ms Puzzles for children  Weight: 1 Liked the puzzle: 100% 02.01.2010
A Megamind has two bags and 100 M&Ms. He needs to put all the candies into the bags so that one bag has twice as many M&Ms as the other. He cannot split the M&Ms. What should the Megamind do?
Comments:  11 | check your solution  
Defective pixel Algebra, arithmetic  Weight: 1 Liked the puzzle: 100% 03.01.2010

There is true expression on panel. But only one pixel is defective. Which one?

Press for see in full size.
Comments:  1 | check your solution  
States and characters Patterns and correspondences  Weight: 1 Liked the puzzle: 100% 26.01.2010
Florida - n, New York - r, Texas - n, Washington - ?
Comments:  1 | check your solution  
Five days Puzzles for children  Weight: 1 Liked the puzzle: 85% 20.01.2011
Can you describe five consecutive days without referring to weekdays or days of the month?
Comments:  6 | check your solution  
Six glasses Puzzles for children  Weight: 1 Liked the puzzle: 100% 22.01.2011
A row of six glasses is on a table. Three full glasses are followed by three empty glasses. Is it possible to make these glasses alternate: full,empty full, etc by touching only one glass?
Comments:  3 | check your solution  
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