Volume and Surface Area

How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 8 m x 6 m x 22.5 cm?

A 5600

B 6000

C 6400

D 7200

ANS:C - 6400

Number of bricks =	Volume of the wall	=		800 x 600 x 22.5		= 6400.
	Volume of 1 brick			25 x 11.25 x 6

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