13 cm RulerMath brain teasers require computations to solve.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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