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How many bricks, each measuring 25cm×11.25cm×6cm ,will be needed to build a wall 8 m long, 6 m high and 22.5 cm thick?

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5600

6000

6400

7200

answer is C.

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Detailed Solution

We know that the volume of cuboid =length×breadth×height
So,
Volume of brick =25 cm×11.25 cm×6 cm
=1678.5

{cm}^{3}

And volume of the wall =80×60×22.5
=10800000

{cm}^{3}

So, the number of bricks =

\frac{10800000}{1678.5}

= 6400
Hence (3) is the correct option.

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