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For the solid cube: Volume of the solid cube = a³ Weight of the solid cube = 400 kg Thus, a³ corresponds to 400 kg. For the hollow cube: Outer side length = 3a Inner side length = 2a Volume of the hollow cube = (3a)³ - (2a)³ = 27a³ - 8a³ = 19a³ Weight of the hollow cube = 19 × 400 = 7600 kg. Answer: c
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