An iron beam is 9 m long, 40 cm wide and 20 cm high. If 1 cubic metre of iron weighs 50 kg, what is the weight of the beam?
We know that,
Volume of a cuboid = Length × Breadth × Height
= 9 × 0.4 × 0.2
= 0.72 m3
Therefore,
Weight = 0.72 × 50
= 36 kg