After two 2-meter-long cylinders with the same bottom area are assembled into a cylinder steel, the surface area is reduced by 0.6 square decimeter. If each cubic decimeter of steel weighs 7.8 kg, how many kg does the assembled steel weigh?

Bottom area: 0.6 △ 2 = 0.3 (square decimeter) 2 m = 20 decimeter volume of cylinder: 0.3 × 20 × 2 = 12 (cubic decimeter) weight: 2 × 7.8 = 93.6 (kg) answer: the weight of the steel after assembly is 93.6 kg

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