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?  Choose the correct choice from the following answers
A) 5600  B) 6000  C) 6400  D) 7200  E) none

Rationale: "solution number of bricks = volume of the wall / volume of 1 brick = ( 800 x 600 x 22.5 / 25 x 11.25 x 6 ) = 6400 . answer c"
Answer: C