• # question_answer Find the number of bricks, each measuring$25\,\,cm\times 12.5\,\,cm\times 7.5\,\,cm$, required to construct a wall 12m long, 5 m high and 0.25 m thick, while the sand and cement mixture occupies 5% of the total volume of wall. A)  6080     B)  3040         C)  1520                           D)  12160

Correct Answer: A

Solution :

(a): Volume of wall $=1200\times 500\times 25$$=15000000\,\,c{{m}^{3}}$ Volume of cement $=5\text{ }%\text{ }of\text{ }15000000$$=750000\text{ }c{{m}^{3}}$ Remaining volume $=15000000-750000$$=14250000\text{ }c{{m}^{3}}$ Volume of a brick $=25\times 12.5\times 7.5=2343.75\,\,c{{m}^{3}}$ Number of bricks used $=\frac{14250000}{2343.75}=6080$

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