Medicine tablet (Pill) taking puzzle

Doctor gave you two types of medicine tablets (pils) A and B, and asked you to take one from each daily. The two tablets are in […]

Coin heap puzzle

You are blindfolded and 10 coins are place in front of you on table. 5 are having their heads-side up and 5 are having their […]

Prisoners and the lightbulb puzzle

There are 10 prisoners are in 10 different cells of a prison. There is no way in which they can communicate with each other. Each night, […]

Gold bar puzzle

You have some work to be done by a worker in 7 days. The worker need to be paid every day after his work. The […]

Points on globe – Interview puzzle

How many points are there on the globe, so that if you walk 1km south, then 1km east and then 1km north, you reach the place where you […]

Fastest horse Interview question

There are twenty five horses and you can conduct a race of only five horses at one time. There is no way to find out […]

Count all left nodes in a Binary tree

One way to ask this question is: Given a Binary tree that represent a family hierarchy. A parent can have at most two children (at most […]

5 Pirates Puzzle dividing 1000 coins

There are 5 pirates, A, B, C, D and E. They have a strict hierarchy, A is senior to B, B is senior to C, […]

Maximum distance with 50 bikes each having fuel capacity of 100 kms

There are 50 bikes, each with a tank that has the capacity to go 100 kms (when the fuel is full). Fuel tanks of all […]

Number of Rectangles on a chess board

Earlier we discussed, how to calculate total number of squares (of all sizes) on the chess board. Here, the problem is, How many rectangles (of […]