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# Puzzle Archives :: Interview Puzzles

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Interview Puzzles Practice Set 8

• 71 / 112

A drinks machine offers three selections - Tea, Coffee or Random (Either tea or Coffee)but the machine has been wired up wrongly so that each button does not give what it claims. If each drink costs 50p, how much minimum money do you have to put into theÂ machine to find out which button gives which selection?

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• 72 / 112

Consider a chessboard with a single Rook. A Rook can move any number of square sideways/forward, but not diagonally.What is the minimum number of moves the Rook needs to make, in order to pass over all the squares on the chessboard and return

to the original position?

Note: Take any square as a starting position for the Rook.

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• 73 / 112

There are N secret agents each knows a different piece of secret information. They can telephone each other and exchange all the information they know. After the telephone call, they both know anything that either of them knew before the call. What is the minimum number of telephone calls needed so that all of them know everything?

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• 74 / 112

Two boys want to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross the river using the boat. How they manage to cross?

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• 75 / 112

A blindfolded man is asked to sit in the front of a carrom board. The holes of the board are shut with lids in random order, i.e. any number of all the four holes can be shut or open. Now the man is supposed to touch any two holes at a time and can do the following.

* Open the closed hole.

* Close the open hole.

* Let the hole be as it is.

After he has done it, the carrom board is rotated and again brought to some position. The man is again not aware of what are the holes which are open or closed. How many minimum numbers of turns does the blindfolded man require to either open all the holes or close all the holes? Note that whenever all the holes are either open or close, there will be an alarm so that the blindfolded man will know that he has won!!!!!

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• 76 / 112

The Old car of Mary requires tires to be changed after each 24000 km. If she wants to go for 42000 km journey then how many minimum numbers of tires she will need?

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• 77 / 112

There is a bus with 7 girls.

Each girl has 7 bags.

In each bag, there are 7 big cats.

Each big cat has 7 little cats.

Each cat has 4 legs.

How many legs are present on the bus?

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• 78 / 112

What is the maximum number of slices can you obtain by cutting a cake with only 4 cuts?

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• 79 / 112

## Pond with Lillies

There is one lily in the pond on 1st June. There are two in the pond on 2nd June. There are four on 3rd June and so on. The pond is full of lilies by the end of the June.

(i) On which date the pond is half full?

(ii) If we start with 2 lilies on 1st June when will be the pond be full of lilies.

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• 80 / 112

A king wants an advisor and comes to ask the 3 wisest sages. He blindfolds them and put the hats on their head. Afterward, the king takes off their blindfolds. He tells them that their hat is either blue or white. He tells them that whoever can deduce the color of their hat will be his next advisor. Also, he tells them that at least one of the sages will be wearing a blue hat. The sages can all see each other's hats except, of course, their own. Sage A sees that the other 2 are wearing blue hats.Â For hours no one spoke, then Sage A stands up and tells the king the color of his hat. What color is it and how does he know?Â

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