First find the volume of brick = 18 * 9 * 6 = 972 cm^3
volume of wall
Take note of units in meters. 1m = 100 cm
so we have 4.5 * 100 * 18 * 3.6 * 100 = 2,916,000 cm^3
So we divide the volume of wall by volume of brick to know how many bricks required
2,916,000/972 = 3,000 bricks
