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Question

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

(a) 5600

(b) 6000

(c) 6400

(d) 7200

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Solution

Length of wall (l)=8 m =800 cm

Breadth (b)=22.5 cm

Height (h)=6 m =600 cm

Volume of wall =l×b×h=800×22.5×600cm3

=10800000cm3

Volume of one brick =25×11.25×6cm3

=1687.5cm3

Number of bricks required

=108000001687.5=6400


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