The length of a rectangular room is double of its breadth.If the area is 512 square inches, what is the perimeter?

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ধরি, ঘরটির প্রস্থ  =  x ইঞ্চি  
$\therefore$ দৈর্ঘ্য ,,   =  2x  ইঞ্চি 
প্রশ্নমতে, x $\times$ 2 x  =  512  
$\Rightarrow x^2$ =  256 
$\Rightarrow$ x  =  16 
$\therefore$ ঘরের প্রস্থ 16 ইঞ্চি
$\therefore$  ,,  দৈর্ঘ্য =  (16  $\times$ 2) ,,  =  32 ,, 
$\therefore$ পরিসীমা  =  2 (16   +   32) ইঞ্চি 
 =  96 ইঞ্চি 
 =  $\frac{96}{12}$ ফুট  =  ৪ ফুট।