question_answer

How many tiles \[40\text{ }cm\times 40\text{ }cm\] each will be required to pave a footpath 1 m wide carried round the outside of a plot\[1800\,\,cm\times 28\,\,m\]?

A)  600                            

B)  5,2000        

C)  9,900                         

D)  5,250

Correct Answer: A

Solution :

Footpath area \[=2\times (2800+200)\times 100+2\times 1800\times 100\] \[=6000\times 100+3600\times 100=960000\]                 No of tiles \[=\frac{461000}{40\times 100}\]