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A retaining wall with measurements $30$ m $\times12$ m $\times 6$ m was constructed with bricks of dimensions  $8$ cm $\times6$ cm $\times 6$ cm. If $60\%$ of the wall consists of bricks, the number of bricks used for the construction is _______ lakhs.

1. $30$
2. $40$
3. $45$
4. $75$

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Migrated from GO Civil 5 months ago by Arjun

Number of bricks $= \dfrac{0.6 \times3000 \times 1200 \times 600}{8 \times 6 \times 6} = 300 \times150 \times 100= 45 \text{ lakhs.}$