(B) 11200
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 cm3
As 1/8 of this volume is covered by mortar, therefore 7/8 of this volume is covered by bricks.
Volume of wall covered by bricks = 7/8 (volume of wall)
= 7/8 (2835000)
= 24806250 cm3
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) cm3