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The Patch Quilt Puzzle
MC12  The Patch Quilt Puzzle
What is the minimum number of the square patches needed to sew a patch quilt of a perfect square? Have you ever asked the patch quilt makers about it? No? Then ask.
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Determine the Number
MC11  Determine the Number
Choose an integer from 0 to 15 (inclusive of 0 and 15). You ask me 7 yes/no questions, I answer them all. I am allowed to lie once (I don't have to lie that once but I am allowed to). Determine the number I am thinking of and tell me how to do this.
Z.
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The Unicursal Marathon
MC10  The Unicursal Marathon
A dozen of figures and supposed all of them can be drawn in one continuous line. But what if not all can be drawn so? Now it's a challenge for you - to find out the truth.
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Ten Bags of Gold
MC9  Ten Bags of Gold
Gold coin weighs one gram, counterfeit coin weighs 1.1 grams. You have 10 bags full of coins, nine of the bags are full of real gold but one bag is full of the counterfeit coins. Given a perfect scale (a pointer scale, for example) and ONE weighing can you determine which bag has counterfeit coins? If so how?
Z.
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How Many Squares?
MC8  How Many Squares?
It's the visual one but it's not an illusion. Count how many dot-per-corner squares are hidden in the given figure and don't let the answer square your error.
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Pigs in Stalls
MC7  Pigs in Stalls
I need to get 21 pigs, in 4 different stalls, and i have to have a odd number in each stall. i seen this in a magazine. And i need some help. I dont think it can work..
thanks. 
eric
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Twelve Crayons
MC6  Twelve Crayons
If you have 12 crayons arranged to make four perfect squares and take away three crayons to make three perfect squares can you answer that?
David V.
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Bridge Puzzle
MC5  Bridge Puzzle
I have a math puzzle that I just can't get. 
You have 4 people (A, B, C and D) that need to cross a bridge under 13 min and only 1 flashlight. You can only go with the flashlight, no more than 2 persons at a time, and always as fast as the slowest person. To cross the bridge persons need: 
A=1min; B=2min; C=5min; D=6min. 
How do you get all 4 of the across in only 13 min? 
P.S. they can't go on each others back! 
A.
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Bears & People
MC4  Bears & People
You have three bears and three humans. The bears and humans have to take a boat from one island to another island. One bear is a special bear who can drive the boat. The boat can hold no more than two - 2 bears, or 2 humans, or 1 bear plus 1 human. There can never be more bears than humans on either island or the human will be killed. How can this be done?
P.
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Grandfather's Breakfast
MC3  Grandfather's Breakfast
I was wondering if you can help me solve this puzzle:
Grandfather is a very hard-boiled customer. In fact, his eggs must be boiled for exactly 15 minutes, no more, no less. One day he asks you to prepare breakfast for him, and the only timepieces in the house are two hourglasses. The larger hourglass takes 11 minutes for all the sand to descend; the smaller takes 7 minutes. What do you do? ...Grandfather grows impatient...
Corrine
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Number Tree
MC2  Number Tree
Here is a puzzle that I am stuck on and cant figure out... My friends and I have tryed to come up the solution and how you get the solution but it is creating more difficulty... Can u please help me with it... what number fits into the circle: carefully look at the connecting lines...
G.
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Man Walking Home
MC1  Man Walking Home
A man leaves office daily at 7pm. A driver with car comes from his home to pick him from office and bring back home. One day he gets free at 5:30 and instead of waiting for driver he starts walking towards home. In the way he meets the car and returns home on car. He reaches home 20 minutes earlier than usual. In how much time does the man reach home usually??
Jilsy
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Last Updated: February 12, 2011 top
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