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Total Surface Area of a Cuboid

A beam 4m lon...

Question

A beam 4m long, 50cm wide and 20cm deep is made of wood which weighs 25 $k g$ per $m^{3}$ . Find the weight of the beam.

A

10 k g

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B

12 k g

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C

13 k g

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D

15 k g

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Solution

The correct option is D $10 k g$
Given,length $= 4 m$
breadth $= 50 c m = 0.5 m$
height $20 c m = 0.2 m$
Volume of beam $= l \times b \times h = 0.4 m^{3}$
Weight of $1$ $m^{3}$ wood is $25$ kg
Weight of $0.4$ $m^{3}$ cubiodal beam $= 25 \times 0.4 = 10$ kg

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