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Numbers on the fence Patterns and correspondences  Weight: 2 Liked the puzzle: 100% 31.12.2009
A Megamind walked along a fence and discovered strange pairs of numbers. First, he saw "188->4". A bit farther, he discovered"232->0". A few steps after that, "100->2". Then, "163->1". Then he saw a little boy who was just beginning to paint something. When the Megamind called the boy, he ran away. Approaching the site, the Megamind saw an incomplete pair "386->...". He took out his favorite marker and completed the pair. What number did he write?
Comments:  1 check your solution  
Unusual purchase Logic puzzles  Weight: 2 Liked the puzzle: 85% 14.01.2010
Buyer: How much do you ask for one?
Seller: 20 roubles.
Buyer: How much for twelve?
Seller: That will go for 40 roubles.
Buyer: How about one hundred and twenty?
Seller: No problem, that would cost you 60 roubles.
What is the buyer asking for?
Comments:  7 check your solution  
Two cubes and labels Logic puzzles  Weight: 2 Liked the puzzle: 91% 19.01.2010
You have two cubes and sufficiently many labels with digits 0,1,2,..,9. You have to place one label on each face of each cube so that you can describe any day of the month. The days 1,2 .., 9 should be described as 01,02,...,09.
Comments:  1 check your solution  
Milk, lemonade, water, and coke Patterns and correspondences  Weight: 2 Liked the puzzle: 100% 27.01.2011
A bottle,a glass, a carafe, and a can contain milk, lemonade, water, and coke. Water and milk are not in the bottle. The container with lemonade is immediately between the carafe and the container with coke. The can does not contain lemonade or water. The glass is next to the can and the container with milk. The containers form a row. How exactly are they arranged?
Comments:  4 check your solution  
50 coins Logic puzzles  Weight: 3 Liked the puzzle: 100% 27.12.2009
Once upon a time, a tsar was holding a reception and the Megamind was among the guests. The tsar decided to test how smart the Megamind was, took him into a dark room, and gave the following task: On the table in this room, there are 50 coins, exactly 10 of them are tails up. In the darkness, it is impossible to determine the sides of these coins. Touching the coins also does not help. The Megamind has to separate these coins into two groups so that the number of tails in both are equal. Can he do it?
Comments:  4 check your solution  
Walking the Earth Geometry puzzles  Weight: 3 Liked the puzzle: 90% 27.12.2009
A Megamind walked one mile South, one mile East, and one mile North, after which he arrived at the starting point of his trip. Where on planet Earth could such a trip take place?
Comments:  1 check your solution  
101 coins Weighing puzzles  Weight: 3 Liked the puzzle: 100% 04.01.2010
Among 101 coins, exactly 50 are counterfeit. A counterfeit coins weighs one gram more or gram less than the real coin (counterfeit coins may weigh differently). You have a balance scale that shows the exact weight differential between the two cups. How can you determine whether a given coin from this set is counterfeit using the scale only once?
Comments:  1 check your solution  
The fifth number Algebra, arithmetic  Weight: 3 Liked the puzzle: 100% 09.01.2010
The set of numbers 1,3,8,120 has a remarkable property: the product of any two numbers is a perfect square minus one. Find a fifth number that could be added to the set preserving its property.
Comments:  4 check your solution  
Weights Weighing puzzles  Weight: 3 Liked the puzzle: 100% 29.01.2010
What is the minimal number of weights required to be able to balance all integer weights 1,2,...,40 on a balance scale? Justify the minimality.
Comments:  4 check your solution  
A number pattern Logic puzzles  Weight: 3 Liked the puzzle: 60% 05.03.2011
What is next: 13 92 78 12 43 ...
Comments:  1 check your solution  
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