When a 1.5-meter-long cylindrical steel is cut into three sections on average, the total surface area of the three sections increases by 12.56 square decimeters. It is known that the weight of each cubic decimeter of steel is 7.8 kg. What is the weight of one section of steel?

When a 1.5-meter-long cylindrical steel is cut into three sections on average, the total surface area of the three sections increases by 12.56 square decimeters. It is known that the weight of each cubic decimeter of steel is 7.8 kg. What is the weight of one section of steel?

1.5m = 15m, (12.56 △ 4) × 15 × 7.8, = 3.14 × 15 × 7.8, = 47.1 × 7.8, = 367.38 (kg), 367.38 △ 3 = 122.46 (kg); a: one section of steel weighs 122.46 kg