Famous Puzzle
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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- 1,610.7K views
- 1 answers
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There is a number, the second digit of which is smaller than its first digit by 4, and if the number was divided by the digits sum, the quotient would be 7. Can you find the number?
View SolutionSubmit Solution- 1,609.6K views
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My room has a square window of 4 feet across and 4 feet down. I decided to get only half the area of the window painted. Even after the painting I found that the clear part of the window still remained a square and still measured 4 feet from top to bottom and 4 feet from side to side.
How is it possible?View SolutionSubmit Solution- 1,608.2K views
- 1 answers
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It is a matter of common knowledge that 0°C is the same as 32°F. It is also a known fact that 100°C equals 212°F. But there is & temperature that gives the same reading on both Centigrade and Fahrenheit scales. Can you find this temperature?
View SolutionSubmit Solution- 1,609.5K views
- 1 answers
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Sam Llyod
The Puzzle: Here is a famous prize problem that Sam Loyd issued in 1882, offering $1000 as a prize for the best answer.
How to arrange the seven figures and the eight ‘dots’ .4.5.6.7.8.9.0. which would add up to 82
View SolutionSubmit Solution- 1,612.5K views
- 1 answers
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There is a number which is very peculiar. This number is three times the sum of its digits. Can you find the number
View SolutionSubmit Solution- 1,609.1K views
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Which would you say is heavier, a pound of cotton or a pound of gold?
View SolutionSubmit Solution- 1,609.1K views
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Two identical trains, at the equator start travelling round the world in opposite directions. They start to-gether, run at the same speed and are on different tracks.
Which train will wear out its wheel treads first?View SolutionSubmit Solution- 1,612.3K views
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There is a lightbulb (incandescent, it’s currently off) in an upstairs room. You are downstairs, standing next to a panel of three light switches (all of them in the off position). One of them controls the lightbulb. The other two don’t do anything. You must figure out which switch controls the bulb, with some restrictions.
1) You can do whatever you want to the lightswitches, as long as it’s either turning them on or turning them off.
2) After fiddling with the lightswitches, you can go upstairs and check the bulb.
3) You cannot see the bulb nor any light shining from it from where you’re initially standing.
4) You cannot make multiple trips up and down the stairs.
5) The lamp is in the ceiling and you don’t have a ladder.
6) You are a mutant with 15-foot-long arms, so #5 is moot.So, you fiddle with the switches, you walk upstairs and check the bulb, and then you immediately decide which switch controls the bulb.
How do you do it?
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Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.
How many miles does the pigeon travel?
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