Julia is as old as John will be when Julia is twice as old as John was when
Julia's age was half the sum of their present ages.
John is as old as Julia was when John was half the age he will be 10 years from now.
How old are John and Julia?
November 26, 2013
December 16, 2012
Gold Coin Barrels
There are 10 barrels of gold coins. In that, some of the barrels contain
1 gram gold coins and some of the barrels contain 2 gram gold coins.
There is a weighing machine which is allowed to weigh only once.
Which of the barrels contain 2 gram coins?
November 2, 2012
October 28, 2012
Opaque Cube Puzzle
You are making an opaque cube (ie you cannot see through its sides). It can be any size that you want it to be. Where do you place the cube so that you can see as many sides as possible?
September 20, 2012
Box Packing Puzzle
Three boxes are all labeled incorrectly, and you must get the labels right.
The labels on the boxes read as given below.
To gain the information you need to move the labels to the correct boxes, you may remove a single item from one of the boxes. You may not look into the boxes, nor pick them up and shake them, etc.
Can this be done? If so, how? If not, why not?
To gain the information you need to move the labels to the correct boxes, you may remove a single item from one of the boxes. You may not look into the boxes, nor pick them up and shake them, etc.
Can this be done? If so, how? If not, why not?
July 22, 2012
Murder in the Desert
This is a story about three people (A, B and C) crossing a desert.
A hated C and decided to kill him - he poisoned the water in his
sack (only C had water). B also wanted to kill C (not knowing
that the water of C had been already poisoned) and so B made a
hole into the sack of C and the water spilt out. A few days later
C died of thirst.
Who was the murderer - A or B?
Who was the murderer - A or B?
May 13, 2012
The Trainee Technician
A 120 wire cable has been laid firmly underground between two telephone exchanges located 10km apart. Unfortunately after the cable was laid it was discovered that the individual wires are not labeled. There is no visual way of knowing which wire is which and thus connections at either end is not immediately possible.
You are a trainee technician and your boss has asked you to identify and label the wires at both ends without ripping it all up. You have no transport and only a battery and light bulb to test continuity. You do have tape and pen for labeling the wires. What is the shortest distance in kilometers you will need to walk to correctly identify and label each wire?
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