Puzzle 109 - solution

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Answer : 96 cm 

 The original width of 9cm. After 3 invocations of magic spell the width of the belt becomes

9/3 , 3/3, 1/3  = 1/3cm

The final area is 4

Therefore final length is 4/width = 4/1/3 = 12 cm.

The length before 3rd invocation is 12*2 = 24 cm

Length of the belt before 2nd invocation is 24*2 = 48 cm.

Length of the belt before 1st invocation is 48*2 = 96 cm. 

 

 

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