Q. A retaining wall with measurements 30m × 12m × 6m was constructed with bricks of dimensions 8cm × 6cm × 6cm. If 60% of the wall consists of bricks, the number of bricks used for the construction is_____lakhs.
(A) 30
(B) 40
(C) 45
(D) 75
Ans: 45
Solution:
Volume of the wall = (3000 × 1200 × 600) cu. cm
Volume of all bricks required = 0.6 × (3000 × 1200 × 600) cu.cm
Volume of each brick = (8 × 6 × 6) cu.cm
Therefore, NO of bricks used
=0.6*3000*1200*600/8*6*6
=4500000
=45 lakhs
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