Alarm clock with snooze interval of 9
Posted on April 11, 2014
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
Problem : Why is it very common to have a 9 minute snooze interval on alarm clocks, why not 10 instead?
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Solution : By setting the snooze time to 9 minutes, the alarm clock only needs to watch the last digit of the time. So, if you hit snooze at 6.45, the alarm goes off again when the last digit equals 4. They couldn’t make it 10 minutes, otherwise the alarm would go off right away, or it would take more circuitry.
[Read More]The U2 riddle
Posted on April 11, 2014
(Last modified on August 7, 2020)
| 2 minutes
| Kinshuk Chandra
Problem : U2 has a concert that starts in 17 minutes and they must all cross a bridge to get there. All four men begin on the same side of the bridge. You must help them across to the other side. It is night. There is one flashlight. A maximum of two people can cross at one time. Any party who crosses, either 1 or 2 people, must have the flashlight with them.
[Read More]Eggs on slanted roof
Posted on April 11, 2014
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
Problem :
A rooster lays an egg at the very top of a slanted roof. Which side is the egg going to roll off on?
**Solution : **
Neither, roosters don’t lay eggs.
Eye color of bus driver
Posted on April 11, 2014
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
Problem : You are the bus driver. At your first stop, you pick up 29 people. On your second stop, 18 of those 29 people get off, and at the same time 10 new passengers arrive. At your next stop, 3 of those 10 passengers get off, and 13 new passengers come on. On your fourth stop 4 of the remaining 10 passengers get off, 6 of those new 13 passengers get off as well, then 17 new passengers get on.
[Read More]The missing dollar
Posted on April 11, 2014
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
Problem Three travelers register at a hotel and are told that their rooms will cost $10 each so they pay $30. Later the clerk realizes that he made a mistake and should have only charged them $25. He gives a bellboy $5 to return to them but the bellboy is dishonest and gives them each only $1, keeping $2 for himself. So the men actually spent $27 and the bellboy kept $2 - what happened to the other dollar of the original $30?
[Read More]What is special about the following sequence of numbers?
Posted on April 11, 2014
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
Problem:
What is special about the following sequence of numbers?
8 5 4 9 1 7 6 10 3 2 0
Solution :
The numbers are in alphabetical order.
(eight, five, four, nine, one, seven, six, ten, three, two, zero)
Get the matching pair out from 12 pair of black and white socks
Posted on April 11, 2014
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
**Problem : ** You have 12 black socks and 12 white socks mixed up in a drawer. It’s early in the morning and you don’t have any light to see the colors. How many socks must you pull out (blindly) to be sure of getting a matching pair?
Solution : 3 socks. If the first sock is black, the second one could be black, in which case you have a matching pair.
[Read More]Move one DIGIT
Posted on April 11, 2014
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
Problem :
By moving one of the following digits, make the equation correct. 62 - 63 = 1
Answer:
26 - 63 = 1 (In other words, 2x2x2x2x2x2, which equals 64)
Find a line to cut two squares in half
Posted on March 30, 2014
(Last modified on August 7, 2020)
| 2 minutes
| Kinshuk Chandra
Problem: Given two squares on a two dimensional plane, find a line that would cut these two squares in half.
Solution: Any Line passing the centers of the two squares will cut them in halves. So, we have to connect the lines between the center of the 2 squares. The straight line that connects the two centers of the two squares will cut both of them into half.
[Read More]One shot or at least two shots in three games?
Posted on March 30, 2014
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
Problem: You have a basketball hoop and someone says that you can play 1 of 2 games.
Game #1: You get one shot to make the hoop.
Game #2: You get three shots and you have to make 2 of 3 shots.
If p is the probability of making a particular shot, for which values of p should you pick one game or the other?
Solution: For game #1, you have probability p of winning.
[Read More]