PUZZLET 018

Volume of a Tank

A
lid-less
tank is a cube in shape, and all the external dimensions are one metre
exactly.
It is designed to be filled to within 10 cm of the tank's top,
when the ratio of the tank material to its contents will be exactly
5%. |

What is the thickness of the tank's material in mm to 2 decimal places of accuracy?

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Last Updated: January 7th, 2010.