Answer :

Volume of cuboid = lbh

where, l = length, b = breadth and h = height

For wall,

Length, l = 270 cm

Breadth, b = 300 cm

Height, h = 350 cm

Volume of wall = 270 × (300) × (350) = 28350000 cm^{3}

As of this volume is covered by mortar, therefore of this volume is covered by bricks.

Volume of wall covered by bricks = 7/8 (volume of wall)

= 7/8 (2835000)

= 24806250 cm^{3}

For one brick,

Length, l = 22.5 cm

Breadth, b = 11.25 cm

Height, h = 8.75 cm

Volume of one brick = lbh

= 22.5(11.25)(8.75) cm^{3}

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