**There are 25 horses. We have to find out the fastest 3 horses. In one race maximum 5 horses can run. How many such r****aces are required in minimum to get the result ?**

## Two Numbers?

There is a one person who have two numbers, he tells sum to the person S and product of those numbers to P.

Now there is this conversion between S and P.

S: I don’t know what are the numbers.

P: I also don’t know what are the numbers.

S: Now i know what are the numbers.

P: Now i also know what are the numbers.

Assuming S and P to be very wise and good in mathematics, **What are those two numbers**?

Note: Numbers are greater than 0.

## Another Bulb Problem

On a circle there are 2014 light bulbs, 2 are ON, and 2012 are OFF. You can choose any bulb and change the neighbor’s state from ON to OFF or from OFF to ON. Doing so, **can we get all 2014 light bulbs on ? If yes, How?**

## Lie tribe and Truth tribe

There are two tribes in Mars, **Lie tribe** and **Truth Tribe**.

Lie tribe always speaks lie, True tribe always speaks truth.

You meet three mars people and ask

From** First Person**: What tribe you belong to?, he replies something in his language which you don’t understand.

**Second person** tells that he is saying that he belongs to Lie Tribe.

**Third person** says that second person is lying.

**What tribe does the third person belong to?**

## 1-40 litres of milk in drum puzzle

There is a drum full of milk, people come for buying milk in the range of 1-40 litres. You can have only 4 cans to draw milk out of drum. tell me what should be the measurement of these four cans so that you can measure any amount of milk in the range of 1-40 litres.

## 10 black socks and 10 white socks puzzle

There are 10 black socks and 10 white socks in a drawer.

Now you have to go out wearing your shoes.

**So how many maximum number of times you need to remove the sock from drawer so that you can go out?**

You can remove only 1 sock at a time.

Obviously, you can’t go outside wearing different socks!

## 4 bottles and water puzzle

There are two bottles of 10 liter; each completely filled with water. Now 2 persons having empty bottles of 4 liter and 5 liter want to take 2-2 liters of water. You can use only these 4 bottles (10 liter-full, 10 liter-full, 5 liter-empty, 4 liter-empty) to transfer the water. Wasting or throwing of water is not permitted. How can this be done?

**Note:** It is assumed that you can not measure water level by comparing water level, or by judging, it should be exact 2 liters of water finally in each 4 and 5 liter water bottle.

## n bulbs in a circle puzzle

There are n bulbs in a circle, each bulb has one switch associated with it, on operating the switch, it toggles the state of the corresponding bulb as well as two bulbs adjacent to that one. Given all bulbs are in off state initially, give a plan to turn all bulbs on finally.

Note: n >= 1.

[Read more…]

## River crossing: she-goat, wolf and cabbage

A farmer is returning from market, where he bought a she-goat, a wolf and cabbage. On the way home he must cross a river. His boat is little, allowing him to take only one of the three things. He can’t keep the she-goat and the cabbage together (because the she-goat would eat it), nor the she-goat with the wolf (because the she-goat would be eaten). How shall the farmer get everything on the other side (without any harm)?

## Inverted cards puzzle

One fine day, Santa and banta were playing cards, but suddenly power went off and they were getting bored. So santa randomly inverted position of 10 cards out of 52 cards(and shuffled it) and asked banta to divide the card in two pile with equal number of inverted cards(number of cards in each pile need not be equal). It was very dark in the room and banta could not see the cards, after thinking a bit banta divided the cards in two piles and quite surprisingly on counting number of inverted cards in both the piles were equal.

[Read more…]