MCQ
How many bricks will be required to construct a wall 8m long, 6m high and 22.5cm thick if each brick measures (25cm × 11.25 × 6cm)?
- A4800
- B5600
- C6400
- D5200
✓
Answer
- 6400
Solution:
Volume of the wall = length × breadth × height
= (8 × 100) × (6 × 100) × 22.5 ...(1m = 100cm)
$=800\times600\times\frac{225}{10}$
$=800\times60\times225$
Volume of 1 brick = length × breadth × height
$=25\times\frac{1125}{100}\times6$
$=\frac{1125}{2}\times3$
Required number of bricks $=\frac{\text{Volume}\ \text{of}\ \text{the}\ \text{wall}}{\text{Volume}\ \text{of}\ 1\ \text{brick}}$
$=\frac{800\times60\times225}{\frac{1125}{2}\times3}$
$=\frac{800\times60\times225\times2}{1125\times3}$
$=6400$
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