Out Of Box
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A 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 machines begins to pro-duce faulty parts—either overweight or underweight.
How can the manufacturer find the faulty machine in only two weighings?View SolutionSubmit Solution- 1,625.9K views
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Rohan was in an interview. The interviewer told his that this was his last question and then he asked him to point at the exact center of the table on which his resume was kept.
He gave an answer after which he was selected. Can you think of what happened inside the interview room?
View SolutionSubmit Solution- 1,627.4K views
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This logic puzzle was published in Martin Gardner’s column in the Scientific American. You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?View SolutionSubmit Solution- 1,628.0K views
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Using six contiguous straight lines, connect all of the sixteen circles shown below
Hint: Think of out the box
View SolutionSubmit Solution- 1,637.3K views
- 2 answers
- 1 votes
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On Bagshot Island, there is an airport. The airport is the homebase of an unlimited number of identical airplanes. Each airplane has a fuel capacity to allow it to fly exactly 1/2 way around the world, along a great circle. The planes have the ability to refuel in flight without loss of speed or spillage of fuel. Though the fuel is unlimited, the island is the only source of fuel.
What is the fewest number of aircraft necessary to get one plane all the way around the world assuming that all of the aircraft must return safely to the airport? How did you get to your answer?Notes:
(a) Each airplane must depart and return to the same airport, and that is the only airport they can land and refuel on ground.
(b) Each airplane must have enough fuel to return to airport.
(c) The time and fuel consumption of refueling can be ignored. (so we can also assume that one airplane can refuel more than one airplanes in air at the same time.)
(d) The amount of fuel airplanes carrying can be zero as long as the other airplane is refueling these airplanes. What is the fewest number of airplanes and number of tanks of fuel needed to accomplish this work? (we only need airplane to go around the world)View SolutionSubmit Solution- 1,635.6K views
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Harassed during important experiments, three Earthlings
were taking three law-breaking Grundi to the authorities.
Suddenly they heard the thunderous roar of a
rockfall, and they knew they were facing sure death
unless they crossed to the other side of the canal. The
portable watercraft they carried with them would hold
only two passengers, regardless of weight. At no time
could there be more Grundi on either side of the water
than Earthlings or the Grundi would overpower the
Earthlings. How could they all cross the water safelyView SolutionSubmit Solution- 1,629.4K views
- 1 answers
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A bridge will collapse in 17 minutes.
4 people want to cross it before it will collapse. It is a dark night and there is only one torch between them.
Only two people can cross at a time.
“A” takes a minute to cross.
“B” takes 2 minutes.
“C” takes 5
and “D” takes 10 minutesHow do they all cross before the bridge collapses?
View SolutionSubmit Solution- 1,654.8K views
- 2 answers
- 2 votes
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Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates.
May 15 16 19
June 17 18
July 14 16
August 14 15 17
Cheryl then tells Albert and Bernard separately the month and the day of her birthday, respectively.
Albert: I don’t know when Cheryl’s birthday is, but I know that Bernard does not know, too.
Bernard: At first, I didn’t know when Cheryl’s birthday is, but I know now.
Albert: Then I also know when Cheryl’s birthday is.
When is Cheryl’s birthday?
View SolutionSubmit Solution- 1,631.7K views
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