How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 7 m x 6 m x 22.5 cm?
Select:
A) 6400  B) 6410  C) 5600  D) 6500  E) 6800

Rationale: "number of bricks = volume of wall / volume of bricks = 700 x 600 x 22.5 / 25 x 11.25 x 6 = = 5600 answer : c"
Answer: C