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Math Puzzle & Brain Teaser Collection contains free online interactive brain teasers & math puzzles with answers & explanations. Site statistics:Click here
Microsofts Puzzle 2008-08-14 06:53:00 You have 5 jars of pills. Each pill weighs10 gram, except for contaminated pills contained in one jar, where each pill weighs 9 gm. Given a scale, how could you tell which jar had the contaminated pills in just one measurement? Read more:Microsofts
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Doctor and Engineer Puzzle 2008-08-14 06:51:00 One of Mr. Bajaj, his wife, their son and Mr. Bajaj's mother is an Engineer and another is a Doctor
. · If the Doctor is a male, then the Engineer is a male. · If the Engineer is younger than the Doctor, then the Engineer and the Doctor are not blood relatives. · If the Engineer is a female, then she and the Doctor are blood relatives. Can you tell who is the Doctor and the Engineer? Read more:Puzzle
What is the number? 2008-08-14 00:40:00 what is number in this series1,16,36,__,81,100,144a)64b)61c)49d)144please explain the logic...
Think carefully!! 2008-08-11 09:49:00 Cathy has six pairs of black gloves and six pairs of brown gloves in her drawer. In complete darkness, how many gloves must she take from the drawer in order to be sure to get a pair that match? Think carefully!!
Du u know y? 2008-07-28 12:58:00 Why is it better to have round manhole covers than square ones?
Find the Word? 2008-07-26 01:39:00 There are three words in the English language that end in "gry". ONE is angry and the other is hungry. EveryONE knows what the third ONE means and what it stands for. EveryONE uses them everyday, and if you listened very carefully, I've given you the third word. What is it? _______gry?
Horse Problem 2008-07-26 01:09:00 There are 25 horses and 5 race tracks. We have to pick the fastest three horses in theleast no of races. PS: In one race only 5 horses can participate. Find the least number of races? Read more:Horse
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Microsofts Puzzle 2008-07-16 07:42:00 You have 5 jars of pills. Each pill weighs10 gram, except for contaminated pills contained in one jar, where each pill weighs 9 gm. Given a scale, how could you tell which jar had the contaminated pills in just one measurement? Read more:Microsofts
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What is the 9 digit number? 2008-05-23 13:04:00 There is a 9 digit number.Its speciality is no digit is repeated.and its right 1 digit is divisible by 1 and right 2 digits is divisible by 2,right 3 digits is divisible by 3.This pattern will be repeated until 9 digits.find out the number.
Where is Rs 1/- 2008-05-13 12:21:00 Three friends went to a hotel. The bill was Rs 75/-Each one contributed Rs.25/-.The waiter took the bill to the cashier.The cashier was happy & decided to give them a discount ofRs.5/- & asked the waiter to return them Rs.5/-.Now the waiter was confused. How to distribute Rs 5 among 3persons?He kept Rs 2 in his pocket & gave one rupee to each one of the 3 persons. So initially each one had contrib
The Prisoner 2008-04-30 01:28:00 A prisoner is faced with a decision where he must open one of two doors. Behind each door is either a lady or a tiger. They may be both tigers, both ladies or one of each. If the prisoner opens a door to find a lady he will marry her and if he opens a door to find a tiger he will be eaten alive. Of course, the prisoner would prefer to be married than eaten alive. Each of the doors has a sign beari Read more:Prisoner
Count the Number 2008-04-16 07:47:00 On my way to the fair, I met 7 jugglersand a bear, every juggler had 6 cats,every cat had 5 rats, every rat had 4 houses, every house had 3 mouses, every mouse had 2 louses, every louse had a spouse. How many in all are going to the fair? Read more:Number
Monkey & Banana 2008-03-24 12:05:00 A ten meter rope is looped through a pulley attached to the ceiling. Half the rope dangles on one side, the other half on the other. At one end of the rope is tied a one kilo bunch of bananas.At the other end of the rope is a one kilo monkey.If the monkey tries to climb the rope, what will happen?
Einstein's Puzzle 2008-03-24 11:25:00 FACTS OF THE PUZZLE[This quiz was made up by Albert Einstein
and according to him 98% will not solve it.]There are five houses in five different colours. In each house lives a person of a different nationality. These five owners drink a certain beverage, smoke a certain brand of cigarette and keep a certain pet. No owners have the same pet, smoke the same brand of smoke or drink the same drink. HI Read more:Puzzle
4 Quarts 2008-03-12 14:31:00 You have a 3-quart bucket, a 5-quart bucket, and an infinite "supply of water. How can you measure out exactly 4 quarts?
Marbles 2008-03-12 14:29:00 You have two jars and 100 marbles. Fifty of the marbles are red, and 50 are blue. One of the jars will be chosen at random; then 1 marble will be withdrawn from that jar at random. How do you maximize the chance that a red marble will be chosen? (You must place all 100 marbles in the jars.)What is the chance of selecting a red marblewhen using your scheme? Read more:Marbles
Four Dogs 2008-03-12 14:28:00 There are four dogs, each at a corner of alarge square.Each of the dogs begins chasing the dog clockwise from it.All of the dogs run at the same speed. All continuouslyadjust their direction so that they are always heading straight toward their clockwise neighbor. How long does it take for the dogs to catch each other? Where does thishappen?
Rectangular Cake 2008-03-12 14:24:00 How do you cut a rectangular cake into two equal pieces when someone has already removeda rectangular piece from it? The removed piece can be pf any size or orientation. You are allowed just one straight cut.
How Many $ ? 2008-03-12 14:21:00 Mike and Todd have $21 between them. Mike has$20 more than Todd. How much does each have?
Water Level 2008-03-12 14:18:00 If you are on a boat and toss a suitcase overboard, will the water level rise or fall?
Microsoft's Puzzle2 2008-03-07 23:23:00 How many points are there on the globe where, by walking one mile south, one mile east, and one mile north,you reach the place where you started? Read more:Microsoft
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Microsoft's Puzzle1 2008-03-07 23:22:00 Why is it that, when you turn on the hot water in a hotel,the hot water comes out instantly? Read more:Microsoft
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Three Ants 2008-03-07 23:15:00 There are three ants at the three corners of a regular triangle. Each ant starts moving on a straight line toward another,randomly chosen corner. What is the probability that none of the ants collide? Read more:Three
3 Switches 2008-03-07 05:33:00 There are three switches in a hallway. One switch controls a light fixture in a room at the far end of the hall. The door to theroom is closed, and you can't see whether the light is on or off. You need to find out which of the three switches controls the light.How can you be certain of finding that out, making just one trip to the room? Read more:Switches
Fuse Problem 2008-03-07 02:05:00 You have two lengths of fuse. Each will burnfor exactly one hour. But the fuses are not necessarily identical and do not burn at a constant rate. There are fast-burning sections and slow-burning sections. How do you measureforty-five minutes using only the fuses and a lighter? Read more:Problem
Logic Puzzle 2008-09-05 04:12:00 If you put a coin in an empty bottle and insert a cork into the neck of the bottle, how could you remove the coin without taking the cork out or breaking the bottle? Read more:Logic
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Funny puzzle 2008-09-05 03:39:00 If a boy and a half could eat a hot dog and a half in a minute and a half, how many hot dogs could six boys eat in six minutes? Read more:Funny
Einstein's Puzzle 2008-09-01 05:07:00 FACTS OF THE PUZZLE[This quiz was made up by Albert Einstein
and according to him 98% will not solve it.]There are five houses in five different colours. In each house lives a person of a different nationality. These five owners drink a certain beverage, smoke a certain brand of cigarette and keep a certain pet. No owners have the same pet, smoke the same brand of smoke or drink the same drink. HI Read more:Puzzle
Crossing The Lake Puzzle 2008-08-29 01:30:00 There are four people in an adventure race that need to get across a lake. They have a small canoe. The rules say that only the slowest person in the canoe can paddle, only one or two can be in the canoe at a time, and they must all cross in the canoe. From practice, they know that:Ann can paddle across in 1 minute.Bill can paddle across in 2 minutes.Sue can paddle across in 5 minutes.Mike can pad Read more:Crossing
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The Lazy Gardener 2008-08-22 07:36:00 It takes two gardeners 8 days to mow a lawn. One is lazy and one is energetic. The energetic one would only take 12 days to mow it on his own. How many days would the lazy gardener take to mow the lawn on his own?