The length of a rectangular room is double of its breath. If the area is 512 square inches, what is the perimeter (in feet)?

A 4
B 6
C 8
D 12

Correct Answer: 8

     Let, breath = x inch           length = 2x inch   now,  2x*x = 512              x = 16 inchSo, the perimeter is = 2(2x+x) = 2*3x = 6x = 6*16 = 96 inch = 8 feet (Ans)
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