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in Surface Areas And Volumes by (29.9k points)
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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? 

A. 56 kg 

B. 48 kg 

C. 36 kg 

D. 27 kg

1 Answer

+1 vote
by (30.3k points)
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Best answer

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

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