How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 8.5 m x 6 m x 22.5 cm?  Choose the correct choice from the following answers
A) 6400  B) 6410  C) 6440  D) 6500  E) 6800

Rationale: "number of bricks = volume of wall / volume of bricks = 850 x 600 x 22.5 / 25 x 11.25 x 6 = = 6800 answer : e"
Answer: E