Question

How many bricks will be required for a wall which is $8$ m long, $8$ m high and $20$ cm thick, if each brick measures $16$ cm $\times$ $8$ cm $\times$ $4$ cm?

• A. $2500$
• B. $25000$
• C. $250000$
• D. None of the above

Answer 1

The correct option is B $25000$

Volume of wall $=8\times 8\times \frac{20}{100}=\frac{64}{5}$

Volume of one brick $=16\times 8\times 4\times {10}^{-6}=512\times {10}^{-6}$

No. of bricks required $=\frac{Volumeofwall}{Volumeofonebrick}=\frac{64\times {10}^6}{5\times 512}=\frac{{10}^6}{40}=25000$