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

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