51.  The Old ShipSome years back I was traveling by a cargo ship from New Zealand to Tahiti. I was curious to look around the ship one day and in the boiler room I asked a man how old the ship was. He smiled and replied in this way: ‘The ship is twice as old […]

41. The Faulty MachineA factory manufacturing flywheels for racing cars has ten machines to make them. The manufacturer knows the correct weight for a flywheel.However, one day one of the machine begins to produce faculty parts    either overweight or underweight. How can the manufacturer find the faulty machine in only two weighings?   43.  Squares […]

29.  The Game of Cats and MiceA number of cast got together and decide to kill between them 999919 mice. Every cat killed an equal number of mice.How many cats do you think there were?Oh, by the way let me clarify just two points     it is not one cat killed the lot, because I have […]