61.  Up the LadderA man wants to reach a window which is 40ft. above the ground. The distance from the foot of the ladder to the wall in 9 feet.How long should the ladder be?   62.    Pigs and Ducks While driving through the countryside one day I saw a farmer tending his pigs and […]

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 […]