A) 18000
B) 20000
C) 22000
D) 24000
Correct Answer: B
Solution :
Area of the room \[=25\,m\times 16\,m\] \[=400\,{{m}^{2}}\] Area of the brick\[=20\,cm\times 10\,cm\] \[=\frac{1}{5}m\times \frac{1}{10}m=\frac{1}{50}{{m}^{2}}\] \[\therefore \] Number of bricks required \[=\left( 400\div \frac{1}{50} \right)=20,000.\]
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