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PUZZLET 194

A Cross of Steel

A tank in the shape of a cross is made from steel less than 3 cm thick. All external dimensions are exactly 1 metre. If it takes 4000 litres of  fluid to fill the tank to within 100 mm of the top, what is the tank's thickness to the nearest one-tenth of a millimetre?

cross


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Last Updated: January 17th, 1006.