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13 cm Ruler

Math brain teasers require computations to solve.

 

Puzzle ID:#14640
Fun:*** (2.4)
Difficulty:*** (2.59)
Category:Math
Submitted By:Gerd*de*****

 

 

 



With a blank ruler (without marks) of exactly 13 cm you can only measure 13 cm. Now you are allowed to set 4 marks so that you can read off all full centimeter values from 1 to 13 cm directly from the ruler.

Where must these 4 marks be?


Much harder question:
The blank ruler has a length of 36 cm and you need 8 marks.
Set the marks.

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