Question

How many bricks of length 25 cm, breadth 15 cm and height 10 cm are required to build a wall of length 6 m, height 2.5 m and breadth 0.5 m?

Answer 1

Let the number of bricks required be n.
Volume of each brick = $25\times 15\times 10=3750{\mathrm{cm}}^3$
Volume of the wall = $6\times 2.5\times 0.5=7.5{\mathrm{m}}^3$
Number of bricks required(n) = $\frac{\mathrm{Vol}\mathrm{of}\mathrm{wall}}{\mathrm{Vol}\mathrm{of}\mathrm{brick}}=\frac{7.5\times 1000000}{3750}=2000$
Thus, 2000 bricks are required to make the wall.