I HAVE A DOUBT IN THE ANSWER YOU REPLIED....!!!!

Inner Diameter of the tube= 12 cm

Inner Radius of the tube = 6 cm

Thickness of the tube = 1 cm

Outer Radius of the tube = 6 + 1 = 7 cm

Density of metal =7.8 g/cm³  

Cross section area of of metal tube = π[7² - 6² ]  = 40.82 sq cm

Length of the tube = 1 m=100 cm.

Volume of the metal =   Crosection area of tube X Length = 40.82 X 100 = 4082 cm³ .

Weight of the tube= metal volumeX Density

                                 = 4082 X 7.8 = 31839.6 g = 31.8 kg

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Team

TopperLearning