The Total solution for NCERT class 6-12
Length of metallic tube = 25 cmInner diameter = 10.4 cm∴ Radius (r) = 10.4/2 = 5.2 cmThickness of metal = 8 mm∴ Outer radius (R) = 5.2 +0.8 = 6.0 cmVolume of metal used = π(R2 – r2) x h