Discussion
A courtyard is 25 meter long and 16 meter board is to be paved with bricks of dimensions 20 cm by 10 cm. The total number of bricks required is
Answer: A
Convert to a single unit before dividing.
\[ \text{courtyard} = 2500 \times 1600 = 4{,}000{,}000 \text{ cm}^{2} \]
\[ \text{brick} = 20 \times 10 = 200 \text{ cm}^{2} \]
\[ n = \frac{4{,}000{,}000}{200} = 20{,}000 \]
A square metre holds 10,000 cm², so the 400 m² courtyard is four million square centimetres - the factor most often lost is that square metre conversion.
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