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ATQ, Side of the cube = (8 × (x + 3)3)1/3 = 2 × (x + 3) = 2x + 6 Length of the rectangle = 2 × (2x + 6) m 2 × (2x + 6) × 20 = 560 2x + 6 = 14 2x = 8 x = 4 m Surface Area of the cube = 6 × 4 = 96 m2
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