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The diagram represents a solid frustum with base radius 21 cm and top radius 14 cm. The frustrum is 15 cm high and is made of a metal whose density is 2 g/#cm^3. #
a) Calculate
i. the volume of metal in the frustrum
ii. the mass of the frustrum in kg.
b) The frustrum is melted down and recast into a solid cube. In the process 20% of the metal is lost. Calculate to one decimal place the length of each side of the cube.