Monthly Archives: March 2013


Some puzzles are more like riddles. Here are some classics:

1) Ox
A farmer in Asia is ploughing his land with a cow. His field is 123 feet long.
With each of its four legs, the cow makes 2 footprints for every feet it walk.
When the farmer walks back along the last straight furrow, how many footprints will he count?

(This one is based on an old problem going back to the middle ages, see the Propositiones by Alcuin of York)

2) Railway crossing
What are the colours on the boom barrier of an uncontrolled railway crossing in Australia?

3) Legal trouble
A plane belonging to a British company with German passengers, crashes on the border between the USA and Canada. In which country will the survivors be buried?

4) More legal stuff
In Belgium, is it legal for a man to merry his widows sister?

Soma cube – part 2

Some time ago I presented some new soma cube puzzles. If you dont know what a soma cube is, have a look here.

Here are 8 new figures:
1) wall
soma cube exercise wall 09

2) stairs 1
soma cube exercise stairs 10

3) airplane
soma cube exercise plane 11

4) stairs 2
soma cube exercise stairs 12

5) castle wall 1
soma cube exercise castle wall 13

6) gate
soma cube exercise gate 14

7) castle tower 2
soma cube exercise castle tower 15

8) castle tower 3
soma cube exercise castle tower 16

If you solved it, we have the solution to
stairs 1,
stairs 2,
castle wall 1,
castle gate,
castle tower 2,
castle tower 3,

Two sons

DiceThis weeks puzzle is a simple chance problem. One of my sons has a one out of four chance to win one or perhaps even two medals at skating this weekend. My other son this weekend has a 1 out of 3 chance to win a medal.

What is the chance that at least one of them wins a medal this weekend?

You can check your solution