Polar bear puzzle

Puzzle:

There is a house with four walls. Each wall faces south. There is a window in each wall.

A bear walks by one of the windows. What colour is the bear?

Solution:
White. If all the walls face south, the house is at the north pole, and the bear, therefore, is a polar bear.

Solution of Bridge crossing Riddle

Solution:
-> 1. + 2. - 2 min
<- 1. - 1 min
-> 3. + 4. - 9 min
<- 2. - 2 min
-> 1. + 2. - 2 min

Total - 16 min
note:
-> forward direction
<- Reverse direction

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Bridge crossing Riddle

Question:
There are four people at the end of bridge. They take following time to cross the bridge:
1st: 1 min
2nd: 2 min
3rd: 7 min
4th: 9 min

Condition: 
1. They have only one torch and they can't cross bridge without torch.
2. and only 2 person can cross bridge at a time.

Solution of Burn the rope....good puzzle

Solution:
Take 2 ropes R1, R2. Light R1 at both ends and R2 at one end. When R1 is completely burned (30 minutes have passed), light R2 at the other end. When R2 is completely burned 45 minutes have passed.

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Burn the rope....good puzzle

Question:
there are unlimited ropes of same length and if we burn them it will take 1 hour.
How to measure 45 mins?

Move block in matrix

Question:
Given a m*n matrix and a person is sitting in (0,0) box, and he has to go to the (m-1,n-1) box of the matrix .And the person can only go to right or down box from its current box position . We need to find out the number of ways he can reach from start to destination box .

100 prisoner`s hat problem..

Question:
There are 100 prisoners , and a officer of them . Now the officer gave the command to the prisoner that next day they will be going to wear a hat which they will not be know its colour . But its colour will be either Red or Blue . And he says that all the prisoner will be standing in a line .
And then the officer will start asking the color of the prisoner one by one from the back . whichever prisoner says the wrong color of his hat ,gets shoot .So now we have to find out wat strategy should the prisoners should apply to safe maximum prisoners .

9 card puzzle

Question:
9 cards are there. u have to arrange them in a 3*3 matrix.
cards are of 4 colors.they are red,yellow,blue,green.
conditions for arrangement: one red card must be in first row
or second row.2 green cards should be in 3rd column.Yellow
cards must be in the 3 corners only. Two blue cards must be in
the 2nd row. Atleast one green card in each row.

Obtain 4 litre from 5 & 3 litre jar

Question:
There are 2 jars 5 lit and 3 lit capacity
measure 4 lit using them

Find top 5 horse from 25 horses

Question:

how to find top 5 horses from 25 if there are only 5 lanes.In min no. of races?

Logic puzzle no.1

Question:
if apple is for 40 cents, banana is for 60 cents and grapefruit is for 80 cents then what pear is for???


Solution:
apple, 2 vowels=2*20=40
banana, 3 vowels=3*20=60
grapefruit, 4 vowels=4*20=80
pear, 2 vowels=2*20=40

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Boat Ladder Puzzle

Puzzle

A boat has a ladder that has six rungs, each rung is one foot apart. The bottom rung is one foot from the water. The tide rises at 12 inches every 15 minutes. High tide peaks in one hour.
When the tide is at its highest, how many rungs are under water?


Solution
None, the boat rises with the tide.

Wine bottle worth puzzle

Puzzle:

A bottle of wine cost £10. The wine was worth £9 more than the bottle.
How much was the bottle worth?

Solution:

Twin brother puzzle

Puzzle

You are travelling down a road to a village. You reach a fork in the road and find a pair of identical twin brothers standing there. One of the brothers always tells the truth and the other always lies.
If you are allowed to ask only one question to one of the brothers to find which is the correct road to the village, what is your question ?



Solution
Point to one of the roads in the fork and ask the following question to one of the brothers.
"If I ask your brother if this is the correct road to the village will he say yes or no?"
If he answers is "no" then it is the correct way to the village.
Think about it -

3 switches puzzle

Puzzle:

You have just walked into a dark two-storey house. There are three light switches on the first floor A, B and C. Only one of the switches works, and it turns on the light on the second floor.

You cannot see the second floor light from the first floor and there are no windows in the building, but you do have a flashlight.

You can only make one trip up the stairs, and you can only flip one switch at a time. How do you determine which of the three switches turns on the light on the second floor ?

Divide traingle in to 5 equal areas

Puzzle:
Divide a triangle into 5 triangles of equal area

Three Ants on Triangle Riddle

Now many companies ask this puzzle while recruiting the students. This puzzle is asked during interview by Microsoft while electing the people for their company.  This puzzle somewhat mathematical oriented. This interview puzzle is famously known as “Three Ants on Triangle” puzzle. People who know the concepts of probability can easily solve this puzzle.

Puzzle:
Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

Bridge Crossing in minimum time

Problem Statement:

Four people need to cross a rickety rope bridge to get back to their camp at night. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. The bridge is too dangerous to cross without a flashlight, and it’s only strong enough to support two people at any given time.

Each of the campers walks at a different speed. One can cross the bridge in 1 minute, another in 2 minutes, the third in 5 minutes, and the slow poke takes 10 minutes to cross. How do the campers make it across in 17 minutes?

Solution:

To get everyone across in 17 minutes, we need get the two slowest people across together; otherwise we are wasting too much time. Once we get them across, how do we not make one of them walk back with the flashlight?

arithmetic operators puzzle 3 1 3 6 =8

Puzzle:

Add arithmetic operators (plus, minus, times, divide) to make the following expression true: 3 1 3 6 = 8. You can use any parentheses you’d like.

Solution:

An interviewer is asking this problem to see how you think and approach problems—so

don’t just guess randomly.

Try approaching this the following way: What sorts of operations would get us to 8? 
I can think of a few:

4 * 2 = 8

16 / 2 = 8

4 + 4 = 8

5 jars of pills riddle (microsoft 2012 puzzle)

Puzzle:
You have 5 jars of pills. Each pill weighs 10 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?