1.  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

Answer: Option C

Explanation:

Number of bricks

= Volume of the wall = 800 x 600 x 22.5
Volume of 1 brick 25 x 11.25 x 6

 = 6400.