Question

a rectangular wall is 27m long, 0.6m thick and 3 m high.Square shaped bricks of side 30cm are used to build the wall. how many bricks is req'd to build the wall

Answer 1

Length of the wall = 27 m
Thickness of the wall = 0.6 m
And height of the wall = 3 m
So the volume of the wall = $27\mathrm{m}\times 0.6\mathrm{m}\times 3\mathrm{m}=48.6{\mathrm{m}}^3$
Each edge of square shaped bricks = 30 cm = 0.30 m
So volume of each brick = ${\left(0.30\mathrm{m}\right)}^3=0.027{\mathrm{m}}^3$
So number of bricks required = $\frac{\mathrm{volume}\mathrm{of}\mathrm{the}\mathrm{wall}}{\mathrm{volume}\mathrm{of}\mathrm{each}\mathrm{brick}}=\frac{48.6}{0.027}=1800$
therefore the number of bricks required is 1800.