Question

Tick (✓) the correct answer:
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

Answer 1

(c) 6400

Volume of each brick$=25\times 11.25\times 6=1687.5c{m}^3$
Volume of the wall$=800\times 600\times 22.5=10800000c{m}^3$
∴ No. of bricks =$\frac{10800000}{1687.5}=6400$